| **Goodwill and Identifiable Intangibles (Intangible Assets) (Details) - USD ($) $ in Millions**                                                                 | 3 Months Ended |        |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|--------|
||
| **Intangible Assets [Line Items]**                                                                                                                              |                |   |   |   |
| Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)                                                                                          |                | $ 0.0  |   |   |
| Amortizable intangible assets, Gross Carrying Amounts                                                                                                           |                |   | $ 218.4 | $ 249.5 |
| Amortizable intangible assets, Accumulated Amortization                                                                                                         |                |   | (124.8) | (122.6) |
| Amortizable intangible assets, Net Book Value                                                                                                                   |                |   | 93.6 | 126.9 |
| Total identifiable intangible Assets, Gross                                                                                                                     |                |   | 690.2 | 732.8 |
| Total identifiable intangibles, Accumulated Amortization                                                                                                        |                |   | (169.3) | (167.1) |
| Total identifiable intangibles, Net Book Value                                                                                                                  |                |   | 520.9 | 565.7 |
| Trade Names                                                                                                                                                     |                |   |   |   |
| **Intangible Assets [Line Items]**                                                                                                                              |                |   |   |   |
| Amortizable intangible assets, Gross Carrying Amounts                                                                                                           |                |   | 122.6 | 121.2 |
| Amortizable intangible assets, Accumulated Amortization                                                                                                         |                |   | (61.7) | (48.8) |
| Amortizable intangible assets, Net Book Value                                                                                                                   |                |   | 60.9 | 72.4 |
| Customer and contractual relationships                                                                                                                          |                |   |   |   |
| **Intangible Assets [Line Items]**                                                                                                                              |                |   |   |   |
| Amortizable intangible assets, Gross Carrying Amounts                                                                                                           |                |   | 95.8 | 128.3 |
| Amortizable intangible assets, Accumulated Amortization                                                                                                         |                |   | (63.1) | (73.8) |
| Amortizable intangible assets, Net Book Value                                                                                                                   |                |   | 32.7 | 54.5 |
| Trade Names                                                                                                                                                     |                |   |   |   |
| **Intangible Assets [Line Items]**                                                                                                                              |                |   |   |   |
| Indefinite Lived Trade Names Gross                                                                                                                              |                |   | 471.8 | 483.3 |
| Indefinite-lived intangible assets, Accumulated Amortization                                                                                                    | [1]            |   | (44.5) | (44.5) |
| Indefinite-Lived Intangible Assets (Trade names)                                                                                                                |                |   | 427.3 | $ 438.8 |
| Mead Trade Name                                                                                                                                                 |                |   |   |   |
| **Intangible Assets [Line Items]**                                                                                                                              |                |   |   |   |
| Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)                                                                                          |                | $ 0.0  |   |   |
| Long-term growth rate                                                                                                                                           |                | 1.50%  |   |   |
| Discount rate                                                                                                                                                   |                | 10.00% |   |   |
| Maximum Percent Above Carrying Value                                                                                                                            |                |   |   | 30.00% |
| Indefinite-Lived Intangible Assets (Trade names)                                                                                                                |                |   |   | $ 113.3 |
| Hilroy Trade Name                                                                                                                                               |                |   |   |   |
| **Intangible Assets [Line Items]**                                                                                                                              |                |   |   |   |
| Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)                                                                                          |                | $ 0.0  |   |   |
| Long-term growth rate                                                                                                                                           |                | 1.50%  |   |   |
| Discount rate                                                                                                                                                   |                | 10.50% |   |   |
| Maximum Percent Above Carrying Value                                                                                                                            |                |   |   | 30.00% |
| Indefinite-Lived Intangible Assets (Trade names)                                                                                                                |                |   |   | $ 11.8 |
| Brazil | Tilibra Trade name                                                                                                                                     |                |   |   |   |
| **Intangible Assets [Line Items]**                                                                                                                              |                |   |   |   |
| Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)                                                                                          |                |   | $ 0.0 |   |
| Long-term growth rate                                                                                                                                           |                |   | 6.50% |   |
| Discount rate                                                                                                                                                   |                |   | 14.50% |   |
| Maximum Percent Above Carrying Value                                                                                                                            |                |   |   | 30.00% |
| Indefinite-Lived Intangible Assets (Trade names)                                                                                                                |                |   |   | $ 63.0 |
|                                                                                                                                                                 |
| [1]Accumulated amortization prior to the adoption of authoritative guidance on goodwill and other intangible assets, at which time further amortization ceased. |

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Indefinite Lived Intangible Asset Accumulated Amortization Prior to the Adoption of Authoritative Guidance
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| - Definition
The maximum percent of a indefinite-lived intangible fair value that is above its carrying value.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
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| - Definition
Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value.  For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.
+ References
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| - Definition
Percentage of assumed long-term growth in revenues, used as an input to measure fair value.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| - Definition
Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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| - Definition
Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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| - Definition
Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.
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| - Definition
Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.
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Amount before accumulated amortization of intangible assets, excluding goodwill.
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No definition available.
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| - Definition
Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.
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