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Debt (Narrative - Senior Credit Facilities) (Details) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) reduction | Feb. 28, 2017 USD ($) | Dec. 08, 2016 USD ($) | Dec. 07, 2016 USD ($) | Mar. 31, 2016
Line of Credit Facility [Abstract] |  |  |  |  |  |
Term loan B facility, initial issuance price, percentage |  |  |  | 99.50% |  |
Quarterly principal payment percent, year two | 1.25% | 1.25% |  |  |  |
Quarterly principal payment percent, year five | 2.50% | 2.50% |  |  |  |
Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ 1,000.0 | $ 1,000.0 |  | $ 1,000.0 | $ 800.0 |
Debt instrument, term |  | 5 years |  |  |  |
Revolving credit facility, available amount | $ 1,000.0 | $ 1,000.0 |  |  |  |
Number of possible reductions in margin | reduction |  | 2 |  |  |  |
Effective interest rate | 3.48% | 3.48% |  |  |  | 2.94%
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 |  | 2.50% |  |  |  |
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 |  |
Term Loan A facility, required principal payment | $ 12.5 |  |  |  |  |
Debt instrument, term |  | 5 years |  |  |  |
Number of possible reductions in margin | reduction |  | 2 |  |  |  |
Effective interest rate | 3.48% | 3.48% |  |  |  |
Quarterly principal payment percent, year one | 1.25% | 1.25% |  |  |  |
Quarterly principal payment percent, year three | 1.75% | 1.75% |  |  |  |
Quarterly principal payment percent, year four | 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 |  |  | $ 400.0 | $ 2,000.0 |  |
Debt instrument, term |  | 7 years |  |  |  |
Effective interest rate | 3.98% | 3.98% |  |  |  |
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% | 0.75% |  |  |  |

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