Segment Information (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reconciliation of reportable segment depreciation and amortization amounts to the consolidated balances
Adjustments to reconcile to consolidated depreciation and amortization, Adjustments for non-wholly-owned entities	$ 24.4	$ 26.6
Adjustments to reconcile to consolidated depreciation and amortization, Amortization of initial payments for new contracts	10.2	9.8
Total consolidated depreciation and amortization	302.1	349.4
Total reported segments
Reconciliation of reportable segment depreciation and amortization amounts to the consolidated balances
Depreciation and amortization	256.5	300.1
All Other and Corporate
Reconciliation of reportable segment depreciation and amortization amounts to the consolidated balances
Depreciation and amortization	11.0	12.9
Totals
Reconciliation of reportable segment depreciation and amortization amounts to the consolidated balances
Depreciation and amortization	$ 267.5	$ 313.0