Debt (Details) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Long-term Debt, by Current and Noncurrent [Abstract]
Finance/capital lease obligations	$ 65,900,000
Other	7,700,000	$ 3,000,000.0
Total debt	1,652,500,000	1,653,800,000
Less: deferred financing costs	6,900,000	7,600,000
Total debt, net	1,645,600,000	1,646,200,000
Less: current portion	60,100,000	47,100,000
Total long-term debt, net	1,585,500,000	1,599,100,000
2026 Senior Notes
Long-term Debt, by Current and Noncurrent [Abstract]
Senior notes	$ 600,000,000.0	$ 600,000,000.0
Stated percentage	5.50%	5.50%
2026 Senior Notes \| Fair Value, Inputs, Level 2
Line of Credit Facility [Abstract]
Notes, fair value	$ 623,400,000	$ 549,300,000
2023 Senior Notes
Long-term Debt, by Current and Noncurrent [Abstract]
Senior notes	$ 450,000,000.0	$ 450,000,000.0
Stated percentage	5.625%	5.625%
2023 Senior Notes \| Fair Value, Inputs, Level 2
Line of Credit Facility [Abstract]
Notes, fair value	$ 466,200,000	$ 435,600,000
Securitized debt
Long-term Debt, by Current and Noncurrent [Abstract]
Securitized debt	$ 93,900,000	$ 9,100,000
Securitized debt \| London Interbank Offered Rate (LIBOR)
Long-term Debt, by Current and Noncurrent [Abstract]
Index rate or LIBOR plus (as a percent)	0.80%	0.80%
Financing and capital lease obligations
Long-term Debt, by Current and Noncurrent [Abstract]
Finance/capital lease obligations	$ 65,900,000	$ 66,700,000
2016 Credit Agreement \| Line of Credit
Line of Credit Facility [Abstract]
Domestic qualified cash	20,700,000
Foreign qualified cash	9,400,000
2016 Credit Agreement \| Term A Facility
Long-term Debt, by Current and Noncurrent [Abstract]
Line of credit	435,000,000.0	$ 525,000,000.0
Line of Credit Facility [Abstract]
Prepaid debt payment	$ 75,000,000.0
2016 Credit Agreement \| Term A Facility \| London Interbank Offered Rate (LIBOR)
Long-term Debt, by Current and Noncurrent [Abstract]
Index rate or LIBOR plus (as a percent)	1.75%	1.75%
2016 Credit Agreement \| Revolver
Long-term Debt, by Current and Noncurrent [Abstract]
Line of credit	$ 0	$ 0
2016 Credit Agreement \| Revolver \| London Interbank Offered Rate (LIBOR)
Long-term Debt, by Current and Noncurrent [Abstract]
Index rate or LIBOR plus (as a percent)	2.00%	2.00%

The carrying amount of the domestic qualified cash as of the balance sheet date.

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Foreign Qualified Cash

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Long-term Debt and Capital Lease Obligations, Including Current Maturities, Gross

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No definition available.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Fair value of financial and nonfinancial obligations.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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Amount of long-term debt and lease obligation, including portion classified as current.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of long-term debt classified as other.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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