Equity, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	$ 4,017.0
Reclassification of the stranded tax effects of the Tax Act		$ 0.0
Balance at end of period	4,530.3	4,017.0
Accumulated Other Comprehensive Loss
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(390.2)	(201.0)	$ (469.0)
Other comprehensive income (loss) before reclassification, net of tax	(56.0)	(185.9)	250.9
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax	15.3	20.2	17.1
Reclassification of the stranded tax effects of the Tax Act		(23.5)
Balance at end of period	(430.9)	(390.2)	(201.0)
Foreign Currency Translation Adjustments
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(197.5)	(33.2)	(273.5)
Other comprehensive income (loss) before reclassification, net of tax	(40.4)	(164.3)	240.3
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax	0.0	0.0	0.0
Reclassification of the stranded tax effects of the Tax Act		0.0
Balance at end of period	(237.9)	(197.5)	(33.2)
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	(0.2)	(0.1)
Other comprehensive income (loss) before reclassification, net of tax	0.1	0.4	(0.1)
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax	0.0	0.0	0.0
Reclassification of the stranded tax effects of the Tax Act		0.0
Balance at end of period	0.3	0.2	(0.2)
Unrealized (gain) loss on cash flow hedges, tax	0.0	(0.1)	0.1
Pension and postretirement benefit plan adjustment
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(192.9)	(167.6)	(195.4)
Other comprehensive income (loss) before reclassification, net of tax	(15.7)	(22.0)	10.7
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax	15.3	20.2	17.1
Reclassification of the stranded tax effects of the Tax Act		(23.5)
Balance at end of period	(193.3)	(192.9)	(167.6)
Pension and postretirement benefit plan adjustment, tax	5.3	6.6	(3.4)
Amounts reclassified from Accumulated Other Comprehensive Income (Loss), tax	$ (4.9)	$ (6.4)	$ (9.1)