Other Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Lease termination settlement	$ 0.0	$ 5.3	$ 0.0	$ 5.3	$ 0.0
Merger and acquisition expense	0.0		7.2	0.0	13.0
Restructuring expense	0.0		19.2	0.0	25.6
Other Income	(0.3)		(1.4)		(1.9)
Other Expense				0.2
Other expense, net	$ (0.3)		$ 25.0	$ 5.5	$ 36.7