Total Debt - Schedule of Total Debt Outstanding (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 16, 2015	Dec. 16, 2013
Debt Instrument [Line Items]
Outstanding Principal	$ 927,500,000	$ 788,700,000
Premium	2,500,000	3,000,000
Issuance Costs and Fees	8,300,000	9,900,000
Long-Term Debt, Net	921,700,000	781,800,000
Current maturities of long-term debt	14,200,000	16,200,000
Total principal amount of debt, net of current maturities	913,300,000	772,500,000
Total debt, net of current maturities	907,500,000	765,600,000
Debt interest rate			5.375%	5.375%
Secured Debt
Debt Instrument [Line Items]
Outstanding Principal	327,500,000	188,700,000
Premium	0	0
Issuance Costs and Fees	500,000	600,000
Long-Term Debt, Net	327,000,000	188,100,000
Unsecured Debt
Debt Instrument [Line Items]
Total debt, net of current maturities	600,000,000
Senior Secured Credit Facility due 2021 | Secured Debt
Debt Instrument [Line Items]
Outstanding Principal	135,000,000	0
Premium	0	0
Issuance Costs and Fees	0	0
Long-Term Debt, Net	135,000,000	0
Term Loan due 2021 | Secured Debt
Debt Instrument [Line Items]
Outstanding Principal	179,300,000	188,700,000
Premium	0	0
Issuance Costs and Fees	500,000	600,000
Long-Term Debt, Net	178,800,000	188,100,000
Swing line of credit | Line of Credit
Debt Instrument [Line Items]
Outstanding Principal	13,200,000	0
Premium	0	0
Issuance Costs and Fees	0	0
Long-Term Debt, Net	13,200,000	0
5.375% Senior Unsecured Notes due 2021 | Unsecured Debt
Debt Instrument [Line Items]
Outstanding Principal	600,000,000	600,000,000
Premium	2,500,000	3,000,000
Issuance Costs and Fees	7,800,000	9,300,000
Long-Term Debt, Net	$ 594,700,000	$ 593,700,000
Debt interest rate	5.375%	5.375%