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Debt (Narrative - Senior Credit Facilities) (Details) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 22, 2018 USD ($) | Mar. 31, 2018 USD ($) reduction | Dec. 08, 2016 USD ($) | Dec. 07, 2016 USD ($)
Line of Credit Facility [Abstract] |  |  |  |
Coupon rate |  | 5.875% |  |
Quarterly principal payment percent, year five |  | 2.50% |  |
Revolving Credit Facility |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ 1,500.0 | $ 1,500.0 | $ 1,000.0 | $ 800.0
Revolving credit facility, available amount |  | $ 1,500.0 |  |
Debt Instrument, Interest Rate, Potential Reductions in Interest Rate |  | 2 |  |
Effective interest rate |  | 3.63% |  |
Change in control, trigger percentage |  | 50.00% |  |
Letter of Credit |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Letters of credit outstanding, amount |  | $ 0.0 |  |
Minimum | Revolving Credit Facility |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Revolving credit facility, commitment fee annual percentage |  | 0.25% |  |
Maximum | Revolving Credit Facility |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Revolving credit facility, commitment fee annual percentage |  | 0.375% |  |
Base Rate | Revolving Credit Facility |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Basis spread on variable interest rate |  | 0.75% |  |
LIBOR | Revolving Credit Facility |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Basis spread on variable interest rate |  | 1.75% |  |
Potential increase in interest rate if certain leverage ratios are met, total |  | 0.50% |  |
Potential increase in interest rate if certain leverage ratios are met, per reduction |  | 0.25% |  |
LIBOR | Minimum | Revolving Credit Facility |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Coupon rate |  | 0.00% |  |
Term Loan A Facility | Term Loan |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Number of possible increases in margin | reduction |  | 2 |  |
Effective interest rate |  | 3.63% |  |
Quarterly principal payment percent, year one |  | 0.00% |  |
Quarterly principal payment percent, year two |  | 1.25% |  |
Quarterly principal payment percent, year three |  | 1.75% |  |
Quarterly principal payment percent, year four |  | 2.50% |  |
Term Loan A Facility | Base Rate | Term Loan |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Basis spread on variable interest rate |  | 0.75% |  |
Term Loan A Facility | LIBOR | Term Loan |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Basis spread on variable interest rate |  | 1.75% |  |
Potential increase in interest rate if certain leverage ratios are met, total |  | 0.50% |  |
Potential increase in interest rate if certain leverage ratios are met, per reduction |  | 0.25% |  |
Term Loan A Facility | LIBOR | Minimum | Term Loan |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Coupon rate |  | 0.00% |  |
Term Loan B Facility | Term Loan |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Effective interest rate |  | 4.13% |  |
Quarterly principal payment percent |  | 0.25% |  |
Prepayment premium percent |  | 1.00% |  |
Term Loan B Facility | Base Rate | Term Loan |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Basis spread on variable interest rate | 1.25% |  |  |
Term Loan B Facility | LIBOR | Term Loan |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Basis spread on variable interest rate | 2.25% |  |  |
Term Loan B Facility | LIBOR | Minimum | Term Loan |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Coupon rate |  | 0.00% |  |
Senior Credit Facilities |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Net Income, Amount Free of Restrictions |  | $ 468.1 |  |
Retained Earnings, Amount Free of Restrictions |  | $ 516.6 |  |

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