Schedule II (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Beginning Balance	$ 1.9	$ 2.6	$ 3.7
Valuation Allowances and Reserves, Charged to Cost and Expense	2.3	2.5	3.3
Valuation Allowances and Reserves, Deductions	2.6	3.2	4.4
Valuation Allowances and Reserves, Ending Balance	$ 1.6	$ 1.9	$ 2.6