Commitments and Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loss Contingencies [Line Items]
Rent expense under operating leases	$ 133.9	$ 100.6	$ 99.1
Financial instruments expiration period	3 years
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013	111.2
2014	95.1
2015	84.8
2016	82.1
2017	65.4
Thereafter	203.0
Total	641.6
Less income from subleases	6.3
Net minimum operating lease payments	635.3
Performance guarantee
Loss Contingencies [Line Items]
Financial instruments	790.1
Bank guarantees and letters of credit
Loss Contingencies [Line Items]
Financial instruments	$ 69.4