Accumulated Other Comprehensive Income (Loss) - Changes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			$ 9,119.7
Other comprehensive income (loss) before reclassifications			(50.1)	$ (48.2)
Amounts reclassified from accumulated other comprehensive income (loss)			1.9	11.0
Total other comprehensive income (loss), net of tax	$ 50.4	$ 50.9	(48.2)	(37.2)
Divestiture of foreign subsidiaries	(1.5)		(1.5)
Balance at end of period	9,277.9		9,277.9
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			14.2	(256.0)
Divestiture of foreign subsidiaries	(1.5)		(1.5)
Balance at end of period	(35.5)	(293.2)	(35.5)	(293.2)
Foreign Currency Translation Adjustments, Net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			74.6	(193.6)
Other comprehensive income (loss) before reclassifications			(50.7)	(47.3)
Amounts reclassified from accumulated other comprehensive income (loss)			0.0	0.0
Total other comprehensive income (loss), net of tax			(50.7)	(47.3)
Divestiture of foreign subsidiaries			(1.5)
Balance at end of period	22.4	(240.9)	22.4	(240.9)
Unrecognized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			0.0	(10.9)
Other comprehensive income (loss) before reclassifications			0.0	(3.2)
Amounts reclassified from accumulated other comprehensive income (loss)			0.0	9.9
Total other comprehensive income (loss), net of tax			0.0	6.7
Divestiture of foreign subsidiaries			0.0
Balance at end of period	0.0	(4.2)	0.0	(4.2)
Pension and Other Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(60.4)	(51.5)
Other comprehensive income (loss) before reclassifications			0.6	2.3
Amounts reclassified from accumulated other comprehensive income (loss)			1.9	1.1
Total other comprehensive income (loss), net of tax			2.5	3.4
Divestiture of foreign subsidiaries			0.0
Balance at end of period	$ (57.9)	$ (48.1)	$ (57.9)	$ (48.1)