Employee Retirement Benefits (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013 plan	Dec. 31, 2012	Jun. 30, 2013 Pension Benefits	Jun. 30, 2012 Pension Benefits	Jun. 30, 2013 Pension Benefits	Jun. 30, 2012 Pension Benefits	Jun. 30, 2013 Pension Benefits - U.S.	Jun. 30, 2012 Pension Benefits - U.S.	Jun. 30, 2013 Pension Benefits - U.S.	Jun. 30, 2012 Pension Benefits - U.S.	Jun. 30, 2013 Pension Benefits - Non-U.S.	Jun. 30, 2012 Pension Benefits - Non-U.S.	Jun. 30, 2013 Pension Benefits - Non-U.S.	Jun. 30, 2012 Pension Benefits - Non-U.S.	Jun. 30, 2013 Postretirement Benefits (U.S.)	Jun. 30, 2012 Postretirement Benefits (U.S.)	Jun. 30, 2013 Postretirement Benefits (U.S.)	Jun. 30, 2012 Postretirement Benefits (U.S.)	Jun. 30, 2013 Key officer postretirement car benefit plan	Jun. 30, 2013 Key officer postretirement car benefit plan Minimum
Components of Net Periodic Benefit Cost
Service cost							$ 7.1	$ 7.0	$ 14.4	$ 13.3	$ 0.7	$ 0.3	$ 1.3	$ 0.6	$ 0	$ 0.1	$ 0.1	$ 0.2
Interest cost							6.9	7.4	13.6	13.9	2.3	2.3	4.6	4.6	0.1	0.2	0.3	0.4
Expected return on plan assets							(7.5)	(8.0)	(15.0)	(15.3)	(3.2)	(3.0)	(6.3)	(6.0)	0	0	0	0
Net amortization							4.0	3.2	8.3	6.0	0.1	(0.1)	0.2	(0.1)	0.1	0	0.1	0
Net pension/postretirement expense							10.5	9.6	21.3	17.9	(0.1)	(0.5)	(0.2)	(0.9)	0.2	0.3	0.5	0.6
Other disclosures
Contributions			6.9	11.8	10.6	32.2
Service period																				20 years
Retirement age																				58 years
Life period of participant																			15 years
Eligible age for car benefit																			80 years
Number of multiemployer plans with significant underfunded liabilities	1
Multiemployer Plans, Withdrawal Obligation		$ 23.2