Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	$ 2.8	$ 2.7	$ 5.7	$ 5.3
Interest cost	4.0	4.0	7.9	8.2
Expected return on assets	(4.3)	(4.1)	(8.6)	(8.1)
Amortization of transition obligation			0.1	0
Amortization of prior service credit	(0.3)	(0.4)	(0.7)	(0.8)
Recognized actuarial losses	2.3	2.2	4.7	4.3
Net periodic benefit cost	4.5	4.4	9.1	8.9
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	2.5	2.3	5.0	4.6
Interest cost	3.7	3.8	7.4	7.7
Expected return on assets	(4.3)	(4.1)	(8.6)	(8.1)
Amortization of transition obligation			0.1	0
Amortization of prior service credit	(0.3)	(0.4)	(0.7)	(0.8)
Recognized actuarial losses	2.3	2.2	4.7	4.3
Net periodic benefit cost	3.9	3.8	7.9	7.7
Other Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	0.3	0.4	0.7	0.7
Interest cost	0.3	0.2	0.5	0.5
Expected return on assets	0	0	0	0
Amortization of transition obligation			0	0
Amortization of prior service credit	0	0	0	0
Recognized actuarial losses	0	0	0	0
Net periodic benefit cost	0.6	0.6	1.2	1.2
U.S. Pension Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	3.1	3.2	6.3	6.4
International Pension Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.8	0.6	1.6	1.3
U.S. Other Retirement Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.6	0.6	1.2	1.2
International Other Retirement Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0	0	0	0
U.S. Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	3.7	3.8	7.5	7.6
International Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	$ 0.8	$ 0.6	$ 1.6	$ 1.3