| **Supplementary Balance Sheet Information (Narrative) (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended |
|------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Balance Sheet Related Disclosures [Abstract]**                                                                 |            |   |   |
| Depreciation expense                                                                                             | $ 124.5         | $ 116.3 | $ 109.8 |
| Amortization expense for intangible assets                                                                       | 3.1             | 1.7 | 0.8 |
| Estimated amortization expense for intangible assets, year one                                                   | 1.1             |   |   |
| Estimated amortization expense for intangible assets, year two                                                   | 1.1             |   |   |
| Estimated amortization expense for intangible assets, year three                                                 | 1.1             |   |   |
| Estimated amortization expense for intangible assets, year four                                                  | 1.1             |   |   |
| Estimated amortization expense for intangible assets, year five                                                  | $ 1.1           |   |   |

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| - Definition
The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.
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| - Definition
Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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| - Definition
Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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| - Definition
Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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| - Definition
Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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| - Definition
Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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