Intangible Assets, net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	$ 575.7		$ 577.7
Intangible assets subject to amortization, Accumulated Amortization	(199.5)		(188.6)
Intangible assets
Intangible assets, Gross Carrying Amount	1,121.8		1,125.1
Amortization expense for intangible assets	11.3	10.2
Changes in intangible assets due to foreign currency translation losses	2.9
Summary of estimated aggregate amortization expense for the remaining nine months of 2013 and each of the next five years
2013	33.7
2014	42.9
2015	41.4
2016	39.6
2017	34.2
2018	29.9
Covenants not to compete
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	8.0		8.0
Intangible assets subject to amortization, Accumulated Amortization	(7.2)		(7.1)
Loan fees
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	31.2		31.2
Intangible assets subject to amortization, Accumulated Amortization	(20.8)		(20.2)
Customer lists/relationships
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	522.0		524.0
Intangible assets subject to amortization, Accumulated Amortization	(163.2)		(153.3)
Software - internal use
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	8.1		8.1
Intangible assets subject to amortization, Accumulated Amortization	(5.7)		(5.5)
Other
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	6.4		6.4
Intangible assets subject to amortization, Accumulated Amortization	(2.6)		(2.5)
Trade names
Intangible assets not subject to amortization:
Intangible assets not subject to amortization, Gross Carrying Amount	$ 546.1		$ 547.4