Retirement and Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs of Defined Benefit Retirement Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
U.S. Non-qualified Defined Benefit Retirement Plans
Net periodic benefit costs of defined benefit retirement plans
Service cost	$ 0.3	$ 0.2	$ 0.6	$ 0.5
Interest cost	0.1	0.2	0.3	0.4
Net amortization and deferral	0.8	1.0	1.5	1.9
Settlement expense		1.4		2.7
Net periodic benefit (credit) cost	1.2	2.8	2.4	5.5
European Defined Benefit Retirement Plans
Net periodic benefit costs of defined benefit retirement plans
Service cost	0.2	0.2	0.4	0.4
Interest cost	1.7	1.8	3.3	3.6
Expected return on plan assets	(2.3)	(2.4)	(4.5)	(4.8)
Net amortization and deferral	0.2	0.2	0.4	0.3
Net periodic benefit (credit) cost	$ (0.2)	$ (0.2)	$ (0.4)	$ (0.5)