New and Recently Adopted Accounting Standards - Additional Information (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
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings	$ 2,054.0		$ 2,054.0			$ 1,867.4
Cost of sales	1,346.9	$ 1,219.7	2,681.4	$ 2,418.0
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings					$ 1.6
Cost of sales	$ 6.9		$ 13.1
ASU 2017-07
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification of components of income from operation and interest expense, net and other		$ 0.3		$ 0.6