Benefit Plans (Changes in Projected Benefit Obligation, Fair Value of Plan Assets and Funded Status) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in Benefit Obligation [Roll Forward]
Settlement	$ 139.4
Balance	$ (313.6)
Change in Fair Value of Plan Assets [Roll Forward]
Balance		$ 322.3
Foreign currency translation		0.0	$ 0.0	$ 0.0
Balance		188.9	322.3
International Pension Plan [Member]
Change in Fair Value of Plan Assets [Roll Forward]
Balance		30.3
Balance		29.2	30.3
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Defined Benefit Plan, Settlements, Plan Assets		(149.7)	0.0
Change in Benefit Obligation [Roll Forward]
Balance		(398.5)	(360.8)
Service cost		(10.6)	(9.8)	(9.7)
Interest cost		(13.8)	(17.1)	(14.8)
Participants' contributions		(0.6)	(0.9)
Actuarial (loss) gain		7.8	(44.5)
Benefits/expenses paid		14.6	28.8
Settlement		149.7	0.0
Foreign currency translation		4.3	5.8
Balance		(246.3)	(398.5)	(360.8)
Change in Fair Value of Plan Assets [Roll Forward]
Balance		322.3	284.7
Actual return on assets		(6.0)	32.3
Employer contribution		38.0	35.4
Participants' contributions		0.6	0.9
Benefits/expenses paid		(14.6)	(28.8)
Foreign currency translation		(1.7)	(2.2)
Balance		188.9	322.3	284.7
Funded status at end of year		(57.4)	(76.2)
Defined Benefit Plan, Plan Amendments		(0.8)	0.0
Other Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Defined Benefit Plan, Settlements, Plan Assets		0.0	0.0
Change in Benefit Obligation [Roll Forward]
Balance		(10.1)	(9.2)
Service cost		(0.5)	(0.4)	(1.1)
Interest cost		(0.4)	(0.4)	(0.6)
Participants' contributions		(0.6)	(0.6)
Actuarial (loss) gain		0.8	(0.1)
Benefits/expenses paid		0.6	0.6
Settlement		0.0	0.0
Foreign currency translation		0.0	0.0
Balance		(10.2)	(10.1)	(9.2)
Change in Fair Value of Plan Assets [Roll Forward]
Balance		0.0	0.0
Actual return on assets		0.0	0.0
Employer contribution		0.0	0.0
Participants' contributions		0.6	0.6
Benefits/expenses paid		(0.6)	(0.6)
Foreign currency translation		0.0	0.0
Balance		0.0	0.0	$ 0.0
Funded status at end of year		(10.2)	(10.1)
Defined Benefit Plan, Plan Amendments		$ 0.0	$ 0.0