CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ (1.9)	$ 1.7	$ 2.7
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	$ 2.8	$ (1.7)	$ 9.5