Intangible Assets, net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	$ 577.7	$ 530.9
Intangible assets subject to amortization, Accumulated Amortization	(188.6)	(145.6)
Intangible assets
Intangible assets, Gross Carrying Amount	1,125.1	1,041.5
Impairment loss related to trade name intangible assets	2.5
Amortization expense for intangible assets	45.4	35.8	29.6
Changes in intangible assets due to foreign currency translation losses	3.1
Summary of estimated aggregate amortization expense each of the next five years
2013	45.1
2014	43.1
2015	41.5
2016	39.8
2017	34.4
2012 acquisitions
Intangible assets
Intangible assets acquired, excluding goodwill	83.0
Covenants not to compete
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	8.0	7.3
Intangible assets subject to amortization, Accumulated Amortization	(7.1)	(6.9)
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	(20.2)	(17.6)
Customer lists/relationships
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	524.0	477.7
Intangible assets subject to amortization, Accumulated Amortization	(153.3)	(114.2)
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	(5.5)	(4.7)
Other
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	6.4	6.6
Intangible assets subject to amortization, Accumulated Amortization	(2.5)	(2.2)
Trade names
Intangible assets not subject to amortization:
Intangible assets not subject to amortization, Gross Carrying Amount	547.4	510.6
Intangible assets
Impairment loss related to trade name intangible assets	$ 2.5