Other Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Income and Expenses [Abstract]
Executive retirement and related costs	$ 10.9		$ 10.9
Development income	(0.4)	$ (0.5)	(0.8)	$ (0.9)
Acquisition-related contingencies	0.1	0.3	0.3	0.7
Other items	(0.4)	0.5	(1.0)	1.2
Other expense	$ 10.2	$ 0.3	$ 9.4	$ 1.0