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Subsequent Events (Narrative) (Details) - Interest rate swap agreements - USD ($) $ in Millions | Jul. 31, 2018 | Jun. 30, 2018 | Jun. 25, 2018 | May 23, 2018 | Mar. 31, 2018
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Subsequent Event [Line Items] |  |  |  |  |
Derivative, fixed interest rate |  |  | 2.723% | 2.915% |
Notional amount |  | $ 1,200.0 | $ 200.0 | $ 1,000.0 | $ 0.0
LIBOR | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Derivative, fixed interest rate | 2.89% |  |  |  |
Notional amount | $ 300.0 |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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