Pension and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 1.8	$ 1.6	$ 1.6
Defined Benefit Plan, Fair Value of Plan Assets	457.0
Pension and Other Postretirement Defined Benefit Plans, Liabilities	(86.6)	(68.2)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	107.7	78.2	131.1	118.7
Other Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation		40.4
Defined Benefit Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	502.7	442.7	473.8
Defined Benefit Plan, Service Cost	5.9	6.7	5.7
Defined Benefit Plan, Contributions by Employer	2.4	2.4
Unrecognized net actuarial loss (gain)	14.1
Unrecognized prior service credit	(1.0)
Defined Benefit Plan, Interest Cost	20.7	18.4	19.7
Defined Benefit Plan, Actuarial Gain (Loss)	67.0	(26.8)
Defined Benefit Plan, Benefits Paid	(31.2)	(30.3)
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	(2.4)	0.9
Defined Benefit Plan, Fair Value of Plan Assets	456.9	447.8	409.1
Defined Benefit Plan, Actual Return on Plan Assets	40.3	65.9
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	(2.4)	0.7
Defined Benefit Plan, Funded Status of Plan	(45.8)	5.1
Pension and Other Postretirement Defined Benefit Plans, Liabilities	(45.8)	5.1
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Actuarial Loss (Gain) Recognized	170.9	127.6
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Prior Service Credit (Cost) Recognized	(2.1)	(3.1)
Accumulated other comprehensive loss	168.8	124.5
Defined Benefit Plan, Amounts Recognized in Balance Sheet	123.2	129.6
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	105.4	77.6
Retiree Health and Life [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	40.8	40.4	48.1
Defined Benefit Plan, Service Cost	0.1	0.2	0.2
Defined Benefit Plan, Contributions by Employer	3.9	3.3
Unrecognized net actuarial loss (gain)	0.1
Unrecognized prior service credit	0.1
Defined Benefit Plan, Interest Cost	1.6	1.6	2.0
Defined Benefit Plan, Actuarial Gain (Loss)	2.6	(6.2)
Defined Benefit Plan, Benefits Paid	(3.9)	(3.3)
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	0	0
Defined Benefit Plan, Fair Value of Plan Assets	0	0	0
Defined Benefit Plan, Actual Return on Plan Assets	0	0
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	0	0
Defined Benefit Plan, Funded Status of Plan	(40.8)	(40.4)
Pension and Other Postretirement Defined Benefit Plans, Liabilities	(40.8)	(40.4)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Actuarial Loss (Gain) Recognized	3.3	0.6
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Prior Service Credit (Cost) Recognized	0.4	0.4
Accumulated other comprehensive loss	3.7	1.0
Defined Benefit Plan, Amounts Recognized in Balance Sheet	(37.1)	(39.4)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	$ 2.3	$ 0.6