Recently Adopted and Issued Accounting Standards - Effect of Adoption of New Revenue Recognition Standard (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	$ 1,155.2	$ 1,070.3	$ 2,286.2	$ 2,102.5
Other current liabilities	379.9		379.9			$ 562.0
Other non-current liabilities	621.0		621.0			490.8
Retained earnings	1,593.2		1,593.2			$ 1,735.2
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales			2,285.1
Other current liabilities	379.1		379.1
Other non-current liabilities	617.8		617.8
ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Other current liabilities					$ 2.4
Retained earnings					$ 2.4
ASU 2014-09 | Difference Between Revenue Guidance In Effect Before And After Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales			1.1
Other current liabilities	0.8		0.8
Other non-current liabilities	$ 3.2		$ 3.2