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Number of Loan Facilities

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Proceeds from Issuance of Senior Long-Term Debt, net of Initial purchase discounts and commissions

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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

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Amount of assets pledged to secure a debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate of debt outstanding.

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

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Debt (Narrative) (Details)						12 Months Ended
Debt (Narrative) (Details)	Jan. 31, 2019 USD ($)	Dec. 21, 2018 USD ($)	Feb. 10, 2017 USD ($)	Dec. 28, 2015 USD ($)	Apr. 28, 2014 USD ($)	Dec. 31, 2019 USD ($) loan_facilities	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Long-term debt						$ 1,098,500,000	$ 925,500,000
Loss on debt extinguishment						$ 30,500,000	0	$ 2,600,000
Proceeds from the sale of the Senior Unsecured Notes					$ 294,800,000
Ownership percentage						100.00%
Fair value of total debt						$ 1,100,000,000	900,000,000
Assets pledged as collateral						2,000,000,000.0
Amortization of debt issuance costs						(2,700,000)	(3,100,000)	(3,100,000)
Amortization of debt discount						(900,000)	(400,000)	(400,000)
Future amortization of debt issuance costs						9,300,000	7,200,000	10,300,000
Financing Arrangement, January 2019
Debt Instrument [Line Items]
Debt issuance costs:	$ 20,200,000					14,200,000
Revolving Credit Facility
Debt Instrument [Line Items]
Senior secured credit facility					725,000,000.0
Financing Agreement, April 2014
Debt Instrument [Line Items]
Loss on debt extinguishment								$ 1,100,000
Master note and security agreement
Debt Instrument [Line Items]
Long-term debt						$ 70,700,000	96,200,000
Weighted average interest rate						7.24%
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt						$ 0	0
Weighted average interest rate						4.85%
Debt instrument, term						4 years
Letters of credit outstanding						$ 35,800,000
Remaining borrowing capacity						764,200,000
Third Amendment To Senior Secured Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Senior secured credit facility	800,000,000.0
Term Loan A
Debt Instrument [Line Items]
Long-term debt						$ 768,300,000	281,300,000
Weighted average interest rate						4.52%
Debt instrument, face amount	$ 825,000,000.0		$ 375,000,000.0
Debt instrument, term	5 years		4 years
Term Loan B
Debt Instrument [Line Items]
Long-term debt						$ 0	279,500,000
Weighted average interest rate						7.33%
Debt instrument, face amount	$ 500,000,000.0				300,000,000.0
Debt instrument, term	7 years					7 years
Revolving Credit Facility And Term Loan A \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Revolving Credit Facility And Term Loan A \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Senior Unsecured Notes
Debt Instrument [Line Items]
Long-term debt						$ 243,500,000	243,500,000
Weighted average interest rate						7.00%
Debt instrument, face amount					$ 300,000,000.0
Debt instrument, term						8 years
Unsecured senior note percent					7.00%
International Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt						$ 5,700,000	$ 11,800,000
Weighted average interest rate						1.90%
Number of Loan Facilities \| loan_facilities						2
Remaining borrowing capacity						$ 10,100,000
International Revolving Credit Facility \| Poland, Zlotych \| October 31, 2017
Debt Instrument [Line Items]
Basis spread on variable rate						0.90%
International Revolving Credit Facility \| Poland, Zlotych \| November 20, 2018
Debt Instrument [Line Items]
Basis spread on variable rate						0.70%
International Revolving Credit Facility \| Euro Member Countries, Euro \| October 31, 2017
Debt Instrument [Line Items]
Basis spread on variable rate						0.95%
International Revolving Credit Facility \| Euro Member Countries, Euro \| November 20, 2018
Debt Instrument [Line Items]
Basis spread on variable rate						0.70%
International Revolving Credit Facility \| United Kingdom, Pounds \| October 31, 2017
Debt Instrument [Line Items]
Basis spread on variable rate						0.95%
Secured Debt \| Second International Term Loan
Debt Instrument [Line Items]
Long-term debt		$ 11,800,000				$ 10,500,000
Weighted average interest rate		1.96%
Debt instrument, term		5 years
Secured Debt \| First International Term Loan
Debt Instrument [Line Items]
Long-term debt						$ 6,000,000.0
Weighted average interest rate						1.72%
Debt instrument, face amount				$ 19,900,000
Debt instrument, term				6 years
Long-term Debt \| Financing Arrangement, January 2019
Debt Instrument [Line Items]
Debt issuance costs:	$ 6,000,000.0
Discharge of Debt \| Financing Arrangement, January 2019
Debt Instrument [Line Items]
Debt issuance costs:	$ 14,200,000