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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%