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v3.19.1

Long-term Debt (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) Rate | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |
Unamortized deferred loan costs | $ | $ 22.3 | $ 23.6
Long-term Debt | $ | 1,107.7 | $ 1,100.4
Contractual Quarterly Payments | $ | $ 2.1 |
Leverage Ratio | 2.65 |
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Leverage Ratio in Latest Year of Debt Term | 3.75% |
Leverage Ratio | 4.75% |
Notes Payable to Banks [Member] | Minimum [Member] | $200 Million Revolving Credit Facility, Due March 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 0.25% |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.20% |
Notes Payable to Banks [Member] | Minimum [Member] | Eurodollar [Member] | $200 Million Revolving Credit Facility, Due March 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |
Notes Payable to Banks [Member] | Maximum [Member] | $200 Million Revolving Credit Facility, Due March 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.35% |
Notes Payable to Banks [Member] | Maximum [Member] | $825 Million Term B Loan Facility, due June 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Interest Rate During Period | 4.50% |
Notes Payable to Banks [Member] | Maximum [Member] | Eurodollar [Member] | $200 Million Revolving Credit Facility, Due March 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 2.25% |
Notes Payable to Banks [Member] | Maximum [Member] | Eurodollar [Member] | $825 Million Term B Loan Facility, due June 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00% |
$200 Million Revolving Credit Facility, Due March 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ | $ 190.1 |

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