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Debt (Narrative - Senior Credit Facilities) (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 11, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) reduction | Mar. 31, 2017 | Dec. 12, 2017 USD ($) | Dec. 08, 2016 USD ($)
Line of Credit Facility [Abstract] |  |  |  |  |  |
Term loan B facility, initial issuance price, percentage |  |  |  |  |  | 99.50%
Loss on extinguishment of debt associated with other voluntary prepayments of Term Loan B/Term Loan B-1 |  | $ 1.8 | $ 19.8 |  |  |
Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Debt instrument, term |  |  | 5 years |  |  |
Revolving credit facility, maximum borrowing capacity |  | 1,000.0 | $ 1,000.0 |  |  | $ 1,000.0
Revolving credit facility, available amount |  | $ 1,000.0 | $ 1,000.0 |  |  |
Number of possible reductions in margin | reduction |  |  | 2 |  |  |
Effective interest rate |  | 3.56% | 3.56% |  |  |
Change in control, trigger percentage |  | 50.00% | 50.00% |  |  |
Letter of Credit |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Letters of credit outstanding, amount |  | $ 0.0 | $ 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 |  |  |  | 1.50% |  |
LIBOR | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Basis spread on variable interest rate |  |  | 2.00% | 2.50% |  |
Potential reduction in interest rate if certain leverage ratios are met, total |  |  | 0.50% |  |  |
Potential reduction in interest rate if certain leverage ratios are met, per reduction |  |  | 0.25% |  |  |
Term Loan A Facility | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Principal amount issued |  |  |  |  |  | 1,000.0
Debt instrument, term |  |  | 5 years |  |  |
Number of possible reductions in margin | reduction |  |  | 2 |  |  |
Effective interest rate |  | 3.56% | 3.56% |  |  |
Quarterly principal payment percent, year one |  | 1.25% | 1.25% |  |  |
Quarterly principal payment percent, year two |  | 1.25% | 1.25% |  |  |
Quarterly principal payment percent, year three |  | 1.75% | 1.75% |  |  |
Quarterly principal payment percent, year four |  | 2.50% | 2.50% |  |  |
Quarterly principal payment percent, year five |  | 2.50% | 2.50% |  |  |
Term Loan A Facility | Base Rate | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Basis spread on variable interest rate |  |  | 1.50% |  |  |
Term Loan A Facility | LIBOR | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Basis spread on variable interest rate |  |  | 2.50% |  |  |
Potential reduction in interest rate if certain leverage ratios are met, total |  |  | 0.50% |  |  |
Potential reduction in interest rate if certain leverage ratios are met, per reduction |  |  | 0.25% |  |  |
Term Loan B Facility | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Principal amount issued | $ 925.0 |  |  |  | $ 900.0 | $ 2,000.0
Debt instrument, term |  |  | 7 years |  |  |
Principal amount of voluntary prepayment | $ 25.0 | $ 75.0 |  |  |  |
Effective interest rate |  | 3.81% | 3.81% |  |  |
Quarterly principal payment percent |  | 0.25% | 0.25% |  |  |
Prepayment premium percent |  | 1.00% | 1.00% |  |  |
Term Loan B Facility | Base Rate | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Basis spread on variable interest rate | 2.00% |  |  |  |  |
Term Loan B Facility | LIBOR | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Basis spread on variable interest rate | 3.00% |  |  |  |  |
Term Loan B Facility | LIBOR | Minimum | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Coupon rate | 0.75% |  |  |  |  |
Term Loan B-1 Facility | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Principal amount issued | $ 900.0 |  |  |  |  |
Debt instrument, term |  |  | 6 years |  |  |
Percentage (per annum) by which the applicable margin under Term Loan B-1 is less than the margin under the Term Loan B |  | 0.75% | 0.75% |  |  |
Term Loan B-1 Facility | Base Rate | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Basis spread on variable interest rate |  |  | 1.25% |  |  |
Term Loan B-1 Facility | LIBOR | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Basis spread on variable interest rate |  |  | 2.25% |  |  |
Term Loan B-1 Facility | LIBOR | Minimum | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Coupon rate |  | 0.75% | 0.75% |  |  |
Term Loan B and Term Loan B-1 |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Loss on extinguishment of debt associated with other voluntary prepayments of Term Loan B/Term Loan B-1 |  | $ 1.8 | $ 19.8 |  |  |
Term Loan B and Term Loan B-1 | Term Loan |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Principal amount of voluntary prepayment |  |  | $ 740.0 |  |  |

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