Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]
Rent expense	$ 20.2	$ 18.8	$ 22.8
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital lease payments due in two years	13.9
Capital lease payments due in three years	12.6
Capital Lease payments due in four years and thereafter	27.7
Commitments to fund other-long term investments	115.9
Capital Leases, Future Minimum Payments Due, Next Twelve Months	15.3
Reserve for probable liability from mandatory shared market mechanisms	13.0
OB Services
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital lease payments due in two years	5.3
Capital lease payments due in three years	1.9
Cash proceeds received a result of entering into the sale-leaseback transactions		23.1
Capital lease obligation	12.5	18.2
Capital lease asset	10.9	16.1
Capital Leases, Future Minimum Payments Due, Next Twelve Months	$ 5.3
Furniture and equipment | OB Services
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital lease term (in years)		5 years
Capitalized software | OB Services
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital lease term (in years)		4 years