Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Beginning Balance		$ (304.3)	$ (196.3)
Accounting principle change			33.6
Other comprehensive (loss) income before reclassifications (1)		(78.2)	(82.0)
Amounts reclassified from AOCI		7.2	3.0
Net current period other comprehensive income (loss)		(71.0)	(108.0)
Ending Balance		(375.3)	(304.3)
Translation
Beginning Balance		(192.1)	(116.8)
Other comprehensive (loss) income before reclassifications (1)	[1]	(39.4)	(66.2)
Amounts reclassified from AOCI		0.0	0.0
Net current period other comprehensive income (loss)		(39.4)	(75.3)
Ending Balance		(231.5)	(192.1)
Other comprehensive (loss) income before reclassifications within the translation component, amount excluded		1.4	3.9
Foreign Currency Hedges
Beginning Balance		(1.9)	(5.1)
Other comprehensive (loss) income before reclassifications (1)		(0.7)	4.2
Amounts reclassified from AOCI		0.0	0.0
Net current period other comprehensive income (loss)		(0.7)	3.2
Ending Balance		(2.6)	(1.9)
Interest Rate Hedges
Beginning Balance		10.6	8.1
Other comprehensive (loss) income before reclassifications (1)		(8.8)	(1.4)
Amounts reclassified from AOCI		3.4	2.6
Net current period other comprehensive income (loss)		(5.4)	2.5
Ending Balance		5.2	10.6
Pension and Other Post-Retirement Benefits
Beginning Balance		(121.0)	(82.6)
Other comprehensive (loss) income before reclassifications (1)		(29.4)	(18.6)
Amounts reclassified from AOCI		3.8	0.4
Net current period other comprehensive income (loss)		(25.6)	(38.4)
Ending Balance		(146.6)	(121.0)
Other
Beginning Balance		0.1	0.1
Other comprehensive (loss) income before reclassifications (1)		0.1	0.0
Amounts reclassified from AOCI		0.0	0.0
Net current period other comprehensive income (loss)		0.1	0.0
Ending Balance		$ 0.2	0.1
Accounting Standards Update 2018-02 [Member]
Accounting principle change			(29.0)
Accounting Standards Update 2018-02 [Member] | Translation
Accounting principle change			(9.1)
Accounting Standards Update 2018-02 [Member] | Foreign Currency Hedges
Accounting principle change			(1.0)
Accounting Standards Update 2018-02 [Member] | Interest Rate Hedges
Accounting principle change			1.3
Accounting Standards Update 2018-02 [Member] | Pension and Other Post-Retirement Benefits
Accounting principle change			(20.2)
Accounting Standards Update 2018-02 [Member] | Other
Accounting principle change			$ 0.0

[1] Other comprehensive income (loss) before reclassifications within the translation component excludes (gains)/losses of $1.4 and $3.9 and translation attributable to noncontrolling interests for December 31, 2019 and 2018, respectively.