Other Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Current Liabilities [Abstract]
Deferred income	$ 18.4	$ 13.2
Other accrued expenses	27.7	20.3
Dividends payable	10.4	9.5	$ 8.6
Restructuring Reserve	2.1	5.9	$ 0.0
Other	18.4	9.4
Other current liabilities	$ 77.0	$ 58.3