Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			$ 2,793.4
Balance at the end of the period	$ 3,064.3		3,064.3
Foreign Currency Translation
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	(251.3)	$ (217.9)	(186.1)	$ (208.3)
Other comprehensive income before reclassifications	49.5	(43.8)	(15.7)	(53.4)
Net current period other comprehensive income	49.5	(43.8)	(15.7)	(53.4)
Balance at the end of the period	(201.8)	(261.7)	(201.8)	(261.7)
Interest Rate Swaps
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	(4.1)
Other comprehensive income before reclassifications	0.3		(3.8)
Amounts reclassified from accumulated other comprehensive income - net of tax	(0.2)		(0.2)
Net current period other comprehensive income	0.1		(4.0)
Balance at the end of the period	(4.0)		(4.0)
Other
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	(19.4)	(22.4)	(16.7)	(26.2)
Other comprehensive income before reclassifications	3.3	(1.9)	0.6	1.9
Net current period other comprehensive income	3.3	(1.9)	0.6	1.9
Balance at the end of the period	(16.1)	(24.3)	(16.1)	(24.3)
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	(274.8)	(240.3)	(202.8)	(234.5)
Other comprehensive income before reclassifications	53.1	(45.7)	(18.9)	(51.5)
Amounts reclassified from accumulated other comprehensive income - net of tax	(0.2)		(0.2)
Net current period other comprehensive income	52.9	(45.7)	(19.1)	(51.5)
Balance at the end of the period	$ (221.9)	$ (286.0)	$ (221.9)	$ (286.0)