Income Taxes (Components) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income before income taxes:
United States	$ 87.7	$ 134.4	$ 161.4
Foreign	1,053.4	918.4	811.1
Income before income taxes	1,141.1	1,052.8	972.5
Current tax provision:
United States	74.6	39.5	63.7
Foreign	263.8	228.1	183.1
Provision for income taxes, current	338.4	267.6	246.8
Deferred tax provision (benefit):
United States	(32.3)	13.3	(0.7)
Foreign	2.4	(0.4)	11.2
Provision for income taxes, deferred	(29.9)	12.9	10.5
Provision for income taxes	308.5	280.5	$ 257.3
Valuation allowance, related to the foreign net operating loss carryforwards and U.S. state tax credits	37.2	18.5
Change in the valuation allowance, related to foreign net operating loss and foreign and U.S. state credit carryforwards	18.7	$ 3.0
Foreign
Deferred tax provision (benefit):
Operating loss and tax credit carryforwards	126.4
Operating loss and tax credit carryforwards to expire or be refunded	69.4
U.S. Federal
Deferred tax provision (benefit):
Operating loss and tax credit carryforwards	17.4
Operating loss and tax credit carryforwards to expire or be refunded	17.4
U.S. State
Deferred tax provision (benefit):
Operating loss and tax credit carryforwards	7.9
Operating loss and tax credit carryforwards to expire or be refunded	$ 4.0