Net Periodic Pension and Postretirement Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
United States Pension Plan of US Entity, Defined Benefit
Components of Net Periodic Benefit Costs
Service cost	$ 2.0		$ 1.8	$ 5.8	$ 5.3
Interest cost	3.7		3.3	10.6	9.8
Expected return on plan assets	(6.3)		(5.2)	(18.2)	(15.7)
Amortization of net actuarial loss	0.2		0.1	0.5	0.3
Settlement			0.4		0.4
Net pension cost (credit) / Net postretirement benefit cost	(0.4)		0.4	(1.3)	0.1
Employer Contributions
Cash contributions to defined benefit pension plan				10.0
Foreign Pension Plan, Defined Benefit
Components of Net Periodic Benefit Costs
Service cost	1.0		1.5	3.4	4.4
Interest cost	2.8		3.7	8.8	11.1
Expected return on plan assets	(3.2)		(3.6)	(10.0)	(10.7)
Amortization of net actuarial loss	0.5		0.8	1.7	2.4
Amortization of prior service credit				(0.1)	(0.1)
Amortization of transition obligation	0.1		0.1	0.2	0.2
Net pension cost (credit) / Net postretirement benefit cost	1.2		2.5	4.0	7.3
Employer Contributions
Cash contributions to defined benefit pension plan				1.0
Canadian Plans
Components of Net Periodic Benefit Costs
Improvement in the funded status		$ 9.0
Other Postretirement Benefit Plans Defined Benefit
Components of Net Periodic Benefit Costs
Service cost	0.2		0.7	0.6	2.1
Interest cost	0.8		0.9	2.3	2.7
Amortization of net actuarial loss	0.1		0.1	0.4	0.3
Amortization of prior service credit	(0.5)			(1.6)
Net pension cost (credit) / Net postretirement benefit cost	$ 0.6		$ 1.7	$ 1.7	$ 5.1