Debt Debt - Credit Facility (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013 Tranche B Term Loan [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 37.5	$ 40.0
Line of Credit Facility, Remaining Borrowing Capacity	162.5
Debt Instrument, Face Amount			540.0
Long-Term Debt, Required Principal Payments	0.25%
Receivables facility amount outstanding	104.6	106.2
Letters of Credit Outstanding, Amount	5.2
Receivables Facility Remaining Borrowing Capacity	0
Receivables facility maximum borrowing availability	$ 109.8
Accounts Receivable Facility, Renewal Term	364