Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Future Amortization Expense 2012	$ 26.9
Future Amortization Expense 2013	26.8
Future Amortization Expense 2014	24.3
Future Amortization Expense 2015	16.4
Future Amortization Expense 2016	5.5
Finite-Lived Intangible Assets [Line Items]
Amortization Expense of Intangible Assets	20.2	19.4	19.3
Finite-Lived Intangible Assets, Useful Life, Minimum	7
Finite-Lived Intangible Assets, Useful Life, Maximum	15
Gross Amount	236.1	209.5
Accumulated Amortization	(101.8)	(86.4)
Net Amount	134.3	123.1
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	165.9	147.0
Accumulated Amortization	(81.7)	(69.0)
Net Amount	84.2	78.0
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	52.9	45.1
Accumulated Amortization	(12.3)	(9.7)
Net Amount	40.6	35.4
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	17.3	17.4
Accumulated Amortization	(7.8)	(7.7)
Net Amount	$ 9.5	$ 9.7