Accumulated Other Comprehensive Loss, Net of Tax Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	[1]	$ 1.5	$ (4.2)	$ 1.8	$ 2.3
Gains on available-for-sale securities		(0.7)	(0.1)	(0.7)	(1.3)
Losses on derivative instruments		0.5	0.5	1.6	1.5
Amortization of defined benefit pension and postretirement plans items		5.7	1.3	9.2	4.0
Tax effect		(0.6)	(0.4)	(1.8)	(1.4)
Reclassifications from accumulated other comprehensive loss to earnings, net of tax		$ 6.4	$ (2.9)	$ 10.1	$ 5.1

[1] These foreign currency translation adjustments are primarily a result of the sales of businesses