Recently Adopted and Issued Accounting Standards - Effect of Adoption of New Revenue Recognition Standard (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	$ 1,131.0	$ 1,032.2
Other current liabilities	468.8		$ 562.0
Other non-current liabilities	707.8		490.8
Retained earnings	1,502.9		1,735.2
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales			1,130.9
Other current liabilities	467.4
Other non-current liabilities			$ 706.0
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	0.1
Other current liabilities	1.4
Other non-current liabilities	$ 1.8