Revenue - Effect of ASU (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	$ 1,206.5	$ 1,088.5	$ 2,372.3	$ 2,096.3
Cost of goods sold	793.8	690.0	1,569.8	1,331.4
Selling, general and administrative expenses	224.6	246.0	452.4	470.6
Provision for income taxes	22.0	9.5	33.8	19.4
Net income	77.1	(18.9)	148.1	47.0
Less: Net income attributable to noncontrolling interests	2.2	1.9	3.3	3.7
Net income (loss) to common shareholders	74.9	$ (20.8)	144.8	$ 43.3
Assets
Inventories	599.9		599.9		$ 585.9	$ 608.6
Prepaid expenses and other	129.5		129.5		105.6	63.9
Other assets	447.5		447.5		426.7	428.6
Liabilities
Other accrued liabilities	416.3		416.3		491.5	489.6
Deferred income taxes	155.9		155.9		155.9	152.9
Equity
Retained earnings (Accumulated deficit)	136.3		136.3		(9.3)	(21.4)
Accumulated other comprehensive loss	(299.6)		(299.6)			(241.0)
Noncontrolling interests	102.4		102.4		$ 131.8	131.7
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	1,208.1		2,368.1
Cost of goods sold	779.2		1,539.2
Selling, general and administrative expenses	239.3		480.8
Provision for income taxes	22.2		33.4
Net income	78.4		146.5
Less: Net income attributable to noncontrolling interests	2.2		3.1
Net income (loss) to common shareholders	76.2		143.4
Assets
Inventories	623.9		623.9			608.6
Prepaid expenses and other	85.0		85.0			63.9
Other assets	449.9		449.9			428.6
Liabilities
Other accrued liabilities	414.4		414.4			489.6
Deferred income taxes	153.1		153.1			152.9
Equity
Retained earnings (Accumulated deficit)	122.8		122.8			(21.4)
Accumulated other comprehensive loss	(299.2)		(299.2)
Noncontrolling interests	102.1		102.1			131.7
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	(1.6)		4.2
Cost of goods sold	14.6		30.6
Selling, general and administrative expenses	(14.7)		(28.4)
Provision for income taxes	(0.2)		0.4
Net income	(1.3)		1.6
Less: Net income attributable to noncontrolling interests	0.0		0.2
Net income (loss) to common shareholders	(1.3)		1.4
Assets
Inventories	(24.0)		(24.0)			(22.7)
Prepaid expenses and other	44.5		44.5			41.7
Other assets	(2.4)		(2.4)			(1.9)
Liabilities
Other accrued liabilities	1.9		1.9			1.9
Deferred income taxes	2.8		2.8			3.0
Equity
Retained earnings (Accumulated deficit)	13.5		13.5			12.1
Accumulated other comprehensive loss	(0.4)		(0.4)
Noncontrolling interests	$ 0.3		$ 0.3			$ 0.1