Pension and Post-retirement and Other Benefit Plans - Pension and Other Postretirement Benefit Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pensions
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.5	$ 1.8	$ 1.9
Interest cost	13.7	14.7	13.7
Expected return on plan assets	(19.1)	(19.7)	(18.2)
Settlement charge	0.3	2.8
Amortization of prior service (credit) cost	0.0	0.1	0.2
Amortization of net actuarial (gain) loss	4.5	2.7	4.2
Total (income) costs	0.9	2.4	1.8
Other post-retirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.1	0.1
Interest cost	0.2	0.3	0.3
Amortization of prior service (credit) cost	(2.5)	0.0	(0.3)
Amortization of net actuarial (gain) loss	0.0	(0.1)
Total (income) costs	$ (2.3)	$ 0.3	$ 0.1