Pension and Other Benefits (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension Benefits
Components of net periodic benefit cost [Line Items]
Service cost		$ 4.6	$ 3.8	$ 13.6	$ 11.3
Interest cost		10.2	10.3	30.4	30.7
Expected return on plan assets		(13.3)	(11.4)	(39.9)	(34.0)
Amortization of prior service cost		0.1	0.0	0.1	0.1
Amortization of actuarial losses/(gains)		3.2	1.1	9.1	2.9
NET PERIODIC BENEFIT COST		4.8	3.8	13.3	11.0
Other Benefits
Components of net periodic benefit cost [Line Items]
Service cost		0.0	0.0	0.0	0.0
Interest cost		0.3	0.3	0.9	0.9
Expected return on plan assets		0.0	0.0	0.0	0.0
Amortization of prior service cost		(0.2)	(0.3)	(0.7)	(0.7)
Amortization of actuarial losses/(gains)		0.0	0.0	0.0	(0.1)
NET PERIODIC BENEFIT COST		$ 0.1	$ 0.0	0.2	$ 0.1
Domestic Plan
Components of net periodic benefit cost [Line Items]
Contribution to defined benefit pension plans	$ 20.0
Foreign Plan
Components of net periodic benefit cost [Line Items]
Contribution to defined benefit pension plans				2.1
Defined benefit plan estimated total employer contributions in current fiscal year				$ 2.6