Condensed Consolidated Statements of Comprehensive Income (parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Consolidated Statements of Comprehensive Income (parenthetical) [Abstract]
Adjustment to pension and other benefit plans tax impact	$ (1.0)	$ (0.1)	$ (2.9)	$ (0.6)
Unrealized gain or loss on investment, tax impact	0.0	0.0	0.0	0.0
Unrealized gain or loss on cash flow hedge tax impact	$ (0.2)	$ (0.2)	$ (0.2)	$ 0.0