Long-Term Debt Long-term Debt text (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended										6 Months Ended
	Jun. 30, 2014	May 16, 2013 Term A Loans, Term B Loans and Revolving Loans [Member]	Jun. 30, 2014 Term-A Loan Facility due May 2018 [Member]	Feb. 28, 2014 Term-A Loan Facility due May 2018 [Member]	May 16, 2013 Term-A Loan Facility due May 2018 [Member]	Jun. 30, 2014 Term-B Loan Facility due May 2020 [Member]	Feb. 28, 2014 Term-B Loan Facility due May 2020 [Member]	May 16, 2013 Term-B Loan Facility due May 2020 [Member]	Jun. 30, 2014 Revolving Credit Facility due May 2018 [Member]	May 16, 2013 Revolving Credit Facility due May 2018 [Member]	Jun. 30, 2014 Eurodollar [Member] Term-B Loan Facility due May 2020 [Member]	Jun. 30, 2014 Minimum [Member] Revolving Credit Facility due May 2018 [Member]	Jun. 30, 2014 Minimum [Member] Eurodollar Rate or Base Rate [Member] Revolving Loans and Term A Loans [Member]	Jun. 30, 2014 Maximum [Member] Revolving Credit Facility due May 2018 [Member]	Jun. 30, 2014 Maximum [Member] Eurodollar Rate or Base Rate [Member] Revolving Loans and Term A Loans [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 500.0								$ 125.0
Debt Instrument, Face Amount					100.0			275.0
Proceeds from long-term debt				82.5
Repayment of long-term debt							82.5
Line of Credit Facility, Increase in Additional Principal Amount		100.0
Debt Instrument, Basis Spread on Variable Rate											2.50%		1.75%		2.50%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum											1.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage												0.25%		0.40%
Debt Instrument, Interest Rate at Period End			2.20%			3.50%			2.20%
Debt, Weighted Average Interest Rate	2.80%
Leverage Ratio	1.98
Line of Credit Facility, Remaining Borrowing Capacity									$ 93.6