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Debt (Narrative - Senior Credit Facilities) (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) reduction | Jun. 30, 2016 USD ($) | Mar. 31, 2017 | Feb. 28, 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 | $ 11.6 | $ 0.0 |  |  |
Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ 1,000.0 |  |  |  | $ 1,000.0
Debt instrument, term | 5 years |  |  |  |
Revolving credit facility, available amount | $ 1,000.0 |  |  |  |
Number of possible reductions in margin | reduction | 2 |  |  |  |
Effective interest rate | 3.22% |  |  |  |
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 |  |  | 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] |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |
Principal amount issued |  |  |  |  | 1,000.0
Number of possible reductions in margin | reduction | 2 |  |  |  |
Effective interest rate | 3.22% |  |  |  |
Quarterly principal payment percent, year one | 1.25% |  |  |  |
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 | 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] |  |  |  |  |
Debt instrument, term | 7 years |  |  |  |
Principal amount issued | $ 420.0 |  |  | $ 400.0 | $ 2,000.0
Effective interest rate | 4.22% |  |  |  |
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 | 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% |  |  |  |

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