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Accumulated Other Comprehensive Income (Loss) (Rollforward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (461.7)	$ (461.1)
Other comprehensive income (loss) before reclassifications, net of tax	(45.6)	(0.7)
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax	1.6	0.1
Ending Balance	(505.7)	(461.7)
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	2.1	0.2
Other comprehensive income (loss) before reclassifications, net of tax	0.6	6.5
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax	(2.9)	(4.6)
Ending Balance	(0.2)	2.1
Foreign Currency Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(299.2)	(305.4)
Other comprehensive income (loss) before reclassifications, net of tax	(0.3)	6.2
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax	0.0	0.0
Ending Balance	(299.5)	(299.2)
Unrecognized Pension and Other Post-retirement Benefit Costs
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(164.6)	(155.9)
Other comprehensive income (loss) before reclassifications, net of tax	(45.9)	(13.4)
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax	4.5	4.7
Ending Balance	$ (206.0)	$ (164.6)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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