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Accumulated Other Comprehensive Loss, Net of Tax Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	$ 3.3	$ 1.5	$ 16.7	$ 1.8
Gains on available-for-sale securities	0.0	(0.7)	0.0	(0.7)
Losses on derivative instruments	0.6	0.5	1.7	1.6
Amortization of defined benefit pension and postretirement plans items	1.9	5.7	6.0	9.2
Tax effect	(0.6)	(0.6)	(1.7)	(1.8)
Reclassifications from accumulated other comprehensive loss to earnings, net of tax	$ 5.2	$ 6.4	$ 22.7	$ 10.1

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Reclassifications from accumulated other comprehensive loss to earnings, net of tax

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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