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Debt (Narrative - Senior Credit Facilities) (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
reduction
Sep. 30, 2016
USD ($)
Mar. 31, 2017
Dec. 08, 2016
USD ($)
Line of Credit Facility [Abstract]            
Term loan B facility, initial issuance price, percentage           99.50%
Loss on extinguishment of debt $ 6.4 $ 0.0 $ 18.0 $ 0.0    
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 3.23%   3.23%      
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 3.23%   3.23%      
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           $ 2,000.0
Debt instrument, term     7 years      
Principal amount of voluntary prepayment $ 245.0   $ 665.0      
Effective interest rate 4.23%   4.23%      
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%