Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net Income	$ 156.7	$ 17.0	$ 336.6	$ 163.0
Other comprehensive income, net of tax:
Foreign currency translation adjustments	30.7	(2.7)	43.5	18.5
Net unrealized gains on available for sale securities	4.0	12.1	6.7	14.7
Changes in benefit plans net gain (loss) and prior service (cost)/credit	0.6	0.3	1.5	1.3
Other comprehensive income, net of tax	35.3	9.7	51.7	34.5
Comprehensive income	$ 192.0	$ 26.7	$ 388.3	$ 197.5