Pension and Post-retirement and Other Benefit Plans - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Pensions
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (gain) loss	$ 168.0	$ 158.3
Unrecognized prior service cost	0.2	0.2
Total recognized in accumulated other comprehensive (gain) loss	168.2	158.5
Other post-retirement benefits
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (gain) loss	(0.5)	(2.5)
Unrecognized prior service cost	(0.1)	0.0
Total recognized in accumulated other comprehensive (gain) loss	$ (0.6)	$ (2.5)