Retirement and Other Postretirement Benefit Plans - Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
U.S. Non-qualified Defined Benefit Retirement Plans
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)	$ 1.1	$ 1.0
Amortization of actuarial (losses) gains	(4.7)	(3.9)
Amortization of prior service cost		(0.1)
Total recognized in other comprehensive income (pre-tax)	(3.6)	(3.0)
European Defined Benefit Retirement Plans
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)	10.6	(16.5)
Amortization of actuarial (losses) gains	(0.6)	(1.3)
Effect of foreign exchange	(2.9)	0.2
Total recognized in other comprehensive income (pre-tax)	7.1	(17.6)
Postretirement Plans
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)	(0.2)	(1.6)
Amortization of actuarial (losses) gains	0.7	0.4
Total recognized in other comprehensive income (pre-tax)	$ 0.5	$ (1.2)