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Debt (Narrative - Senior Credit Facilities) (Details) $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 22, 2018 USD ($) | Dec. 08, 2016 USD ($) | Jun. 30, 2018 USD ($) reduction
Revolving Credit Facility |  |  |
Line of Credit Facility [Abstract] |  |  |
Debt instrument, term | 5 years |  |
Revolving credit facility, maximum borrowing capacity | $ 1,500.0 |  | $ 1,500.0
Revolving credit facility, available amount |  |  | $ 1,500.0
Number of possible increases in margin | reduction |  |  | 2
Effective interest rate |  |  | 3.84%
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 increases in interest rate upon certain increases to leverage ratios, total |  |  | 0.50%
Potential increase in interest rate upon certain increases to leverage ratios, 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] |  |  |
Principal amount issued |  | $ 750.0 |
Debt instrument, term | 5 years |  |
Potential reductions in interest rate | reduction |  |  | 2
Effective interest rate |  |  | 3.84%
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%
Quarterly principal payment percent, year five |  |  | 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 reduction in interest rate if certain leverage ratios are met |  |  | 0.25%
Potential reduction in interest rate if certain leverage ratios are met |  |  | 0.50%
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] |  |  |
Principal amount issued |  | $ 1,250.0 |
Debt instrument, term |  | 7 years |
Effective interest rate |  |  | 4.34%
Quarterly principal payment percent |  |  | 0.25%
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 |  |  | $ (11.4)
Retained earnings, amount free of restrictions |  |  | $ 506.2

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