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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		3 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Mar. 31, 2013 Out of period adjustment	Sep. 30, 2013 State	Dec. 31, 2012 State	Sep. 30, 2013 United Kingdom operations	Dec. 31, 2012 United Kingdom operations
Income taxes
Net deferred tax liabilities	$ 167.7	$ 298.9
Valuation allowance				$ 21.3	$ 19.7	$ 20.1	$ 19.6
Effective income tax rate (as a percent)	36.30%		1.00%
Percentage increase in effective tax rate for benefit for state income taxes, net of provision from federal income taxes	2.20%
Percentage increase in effective tax rate for benefit of tax exempt income	1.20%