Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	$ 2.8	$ 2.8
Interest cost	2.7	4.0
Expected return on assets	(3.2)	(5.7)
Amortization of prior service credit	(0.3)	(0.3)
Recognized actuarial losses (gains)	0.8	1.3
Net periodic benefit cost	2.8	2.1
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	2.7	2.7
Interest cost	2.6	3.9
Expected return on assets	(3.2)	(5.7)
Amortization of prior service credit	(0.3)	(0.3)
Recognized actuarial losses (gains)	1.1	1.6
Net periodic benefit cost	2.9	2.2
Other Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	0.1	0.1
Interest cost	0.1	0.1
Recognized actuarial losses (gains)	(0.3)	(0.3)
Net periodic benefit cost	(0.1)	(0.1)
U.S. Pension Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	2.3	1.5
International Pension Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.6	0.7
U.S. Other Retirement Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	(0.1)	(0.1)
U.S. Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	2.2	1.4
International Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	$ 0.6	$ 0.7