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Long-Term Debt (Narrative) (Debt Extinguishment, Modification, and Issuance Costs) (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
May 01, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 30, 2015
Debt Instrument [Line Items] |  |  |  |  |
Gain (loss) on debt extinguishment |  | $ (6,300,000) | $ (400,000) | $ 0 |
Debt issuance costs |  | 73,100,000 | 14,400,000 |  |
Term Loan B Facility due 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Capitalized debt issuance costs |  | 66,600,000 |  |  |
Lender fees |  | 22,000,000 |  |  |
Debt issuance costs |  | 61,800,000 | $ 0 |  |
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Capitalized debt issuance costs |  | 8,200,000 |  |  |
Write off of unamortized debt issuance costs |  | 1,600,000 |  |  |
Unamortized costs amortized over term of credit facility |  | 2,000,000 |  |  |
Senior Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Write off of unamortized debt issuance costs |  | 400,000 |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  | $ 800,000,000
Debt issuance costs |  | 2,100,000 |  |  |
Senior Revolving Credit Facility [Member] | Letter of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 1,000,000,000.0 | 15,000,000.0 |  |  |
Period of debt, in years | 5 years |  |  |  |
Eurocurrency Loans [Member] | Term Loan B Facility due 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt extinguishment charge |  | 4,700,000 |  |  |
Write off of unamortized debt issuance costs |  | 300,000 |  |  |
Third party fees |  | 4,300,000 |  |  |
Lender fees |  | $ 100,000 |  |  |

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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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