Equity, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	$ 3,989.8
Balance at end of period	4,017.0	$ 3,989.8
Accumulated Other Comprehensive Loss
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(201.0)	(469.0)	$ (349.5)
Other comprehensive income (loss) before reclassification, net of tax	(185.9)	250.9	(135.8)
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax	20.2	17.1	16.3
Reclassification of the stranded tax effects of the Tax Act	(23.5)
Balance at end of period	(390.2)	(201.0)	(469.0)
Foreign Currency Translation Adjustments
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(33.2)	(273.5)	(164.9)
Other comprehensive income (loss) before reclassification, net of tax	(164.3)	240.3	(108.6)
Balance at end of period	(197.5)	(33.2)	(273.5)
Foreign currency translation adjustments, tax	0.0	0.0	0.0
Unrealized Gain (Loss) on Cash Flow Hedges
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(0.2)	(0.1)	(1.7)
Other comprehensive income (loss) before reclassification, net of tax	0.4	(0.1)	1.6
Balance at end of period	0.2	(0.2)	(0.1)
Unrealized loss on cash flow hedges, tax	(0.1)	0.1	(0.3)
Defined Benefit Plan Adjustment
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(167.6)	(195.4)	(182.9)
Other comprehensive income (loss) before reclassification, net of tax	(22.0)	10.7	(28.8)
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax	20.2	17.1	16.3
Reclassification of the stranded tax effects of the Tax Act	(23.5)
Balance at end of period	(192.9)	(167.6)	(195.4)
Defined benefit plan, before reclassification, tax	6.6	(3.4)	12.3
Amounts reclassified from Accumulated Other Comprehensive Income (Loss), tax	$ (6.4)	$ (9.1)	$ (8.9)

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Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act of 2017.

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

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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss), attributable to parent entity.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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Amount, before reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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