Commitments and Contingent Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Rent expense under operating leases	$ 131.2	$ 136.8	$ 149.7
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2016	85.9
2017	69.6
2018	58.5
2019	43.9
2020	34.5
Thereafter	128.6
Total	421.0
Less income from subleases	5.9
Net minimum operating lease payments	415.1
Performance Guarantee [Member]
Loss Contingencies [Line Items]
Guarantor obligations, maximum exposure, undiscounted	632.9
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 70.6
Indirect Guarantee of Indebtedness [Member]
Loss Contingencies [Line Items]
Guarantor obligations, term (in years)	P2Y
Guarantor obligations, maximum exposure, undiscounted	$ 40.0