Income Taxes (Details ) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income before income taxes:
United States	$ 134.4	$ 161.4	$ 152.8
Foreign	918.4	811.1	693.8
Income before income taxes	1,052.8	972.5	846.6
Current tax provision:
United States	39.5	63.7	47.5
Foreign	228.1	183.1	162.3
Provision for income taxes, current	267.6	246.8	209.8
Deferred tax provision (benefit):
United States	13.3	(0.7)	(0.1)
Foreign	(0.4)	11.2	(1.8)
Provision for income taxes, deferred	12.9	10.5	(1.9)
Provision for income taxes	280.5	257.3	$ 207.9
Valuation allowance, related to the foreign net operating loss carryforwards and U.S. state tax credits	18.5	15.5
Change in the valuation allowance, related to foreign net operating loss and foreign and U.S. state credit carryforwards	3.0	$ (3.9)
Foreign
Deferred tax provision (benefit):
Loss and credit carryforwards	70.3
Tax loss and credit carryforwards that will expire or be refunded at various dates through 2035	37.7
U.S. Federal
Deferred tax provision (benefit):
Loss and credit carryforwards	12.1
Tax loss and credit carryforwards that will expire or be refunded at various dates through 2035	12.1
U.S. State
Deferred tax provision (benefit):
Loss and credit carryforwards	6.7
Tax loss and credit carryforwards that will expire or be refunded at various dates through 2035	$ 3.2