Benefit Plans (Changes in Projected Benefit Obligation, Fair Value of Plan Assets and Funded Status) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in Fair Value of Plan Assets [Roll Forward]
Balance	$ 322.3	$ 284.7
International Pension Plan [Member]
Change in Fair Value of Plan Assets [Roll Forward]
Balance	30.3	28.5
Pension Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Balance	(360.8)	(363.2)
Service cost	(9.8)	(9.7)	(8.5)
Interest cost	(17.1)	(14.8)	(15.5)
Participants' contributions	(0.9)	(0.6)
Actuarial (loss) gain	(44.5)	12.9
Benefits/expenses paid	28.8	16.4
Foreign currency translation	5.8	(1.8)
Balance	(398.5)	(360.8)	(363.2)
Change in Fair Value of Plan Assets [Roll Forward]
Balance	284.7	251.0
Actual return on assets	32.3	40.5
Employer contribution	35.4	8.2
Participants' contributions	0.9	0.6
Benefits/expenses paid	(28.8)	(16.4)
Foreign currency translation	(2.2)	0.8
Balance	322.3	284.7	251.0
Funded status at end of year	(76.2)	(76.1)
Other Retirement Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Balance	(9.2)	(26.0)
Service cost	(0.4)	(1.1)	(1.3)
Interest cost	(0.4)	(0.6)	(1.0)
Participants' contributions	(0.6)	(0.5)
Actuarial (loss) gain	(0.1)	18.5
Benefits/expenses paid	0.6	0.5
Foreign currency translation	0	0
Balance	(10.1)	(9.2)	(26.0)
Change in Fair Value of Plan Assets [Roll Forward]
Balance	0	0
Actual return on assets	0	0
Employer contribution	0	0
Participants' contributions	0.6	0.5
Benefits/expenses paid	(0.6)	(0.5)
Foreign currency translation	0	0
Balance	0	0	0
Funded status at end of year	$ (10.1)	$ (9.2)