Accumulated Other Comprehensive Income (Loss) - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Equity [Abstract]
Pension and other postretirement benefit plans, tax benefit	$ 0.1	$ 0.0
Cumulative pension and other postretirement benefit plans, tax benefit	19.2	13.4
Unrealized gain (loss) on derivatives, tax benefit	(0.3)	(0.8)
Cumulative unrealized gain (loss) on derivatives, tax benefit	$ (0.8)	$ (2.7)