| **Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions** | 12 Months Ended |
|---------------------------------------------------------------------------------------|-----------------|
||
| Allowance for doubtful accounts:                                                      |            |   |   |
| **SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]** |            |   |   |
| Balance Beginning of Year                                                             | $ 4.9           | $ 4.4 | $ 4.0 |
| Charged to Expense                                                                    | 3.2             | 2.5 | 2.1 |
| Deductions                                                                            | (2.7)           | (2.5) | (1.7) |
| Balance End of Year                                                                   | 5.4             | 4.9 | 4.4 |
| Allowance for doubtful accounts: | Change in Accounting Standard                      |            |   |   |
| **SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]** |            |   |   |
| Balance Beginning of Year                                                             | 0.0             | 0.5 | 0.0 |
| Balance End of Year                                                                   |            | 0.0 | 0.5 |
| Deferred income tax asset valuation allowance:                                        |            |   |   |
| **SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]** |            |   |   |
| Balance Beginning of Year                                                             | 1.4             | 0.2 | 0.2 |
| Additions                                                                             | 1.8             | 1.2 | 0.0 |
| Deductions                                                                            | 0.0             | 0.0 | 0.0 |
| Balance End of Year                                                                   | $ 3.2           | $ 1.4 | $ 0.2 |

| X                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Valuation Allowances and Reserves, Additions
+ References
No definition available.
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| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of valuation and qualifying accounts and reserves.
+ References
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.
+ References
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column C)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of decrease in valuation and qualifying accounts and reserves.
+ References
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