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Debt (2016 Senior Term Credit Agreement) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Nov. 22, 2016
Dec. 31, 2015
2014 Term Loan      
Debt Instrument [Line Items]      
Repayments of Debt $ 800.0    
Long-term debt [1] 0.0   $ 800.0
2015 Term Loans      
Debt Instrument [Line Items]      
Repayments of Debt 1,600.0    
Long-term debt [2] $ 0.0   1,600.0
2016 Term Loans      
Debt Instrument [Line Items]      
Base interest rate 0.375%    
Long-term Debt, Weighted Average Interest Rate 2.124%    
Repayments of Debt $ 400.0    
Long-term debt 1,600.0 [3] $ 2,000.0 $ 0.0 [3]
Debt Related Commitment Fees and Debt Issuance Costs $ 6.4    
Guarantor Obligations, Triggering Amount   $ 500.0  
Debt Instrument, Interest Rate During Period 1.375%    
Trailing Four Quarters | 2016 Term Loans      
Debt Instrument [Line Items]      
Debt Instrument, Covenant Description 3.75 to 1.00    
Three Full Fiscal Quarters Following Qualifying Acquisition | 2016 Term Loans      
Debt Instrument [Line Items]      
Debt Instrument, Covenant Description 4.25 to 1.00    
[1] The 2014 Term Loan was terminated and repaid in the fourth quarter of 2016 in conjunction with the effectiveness of the 2016 Term Loans.
[2] The 2015 Term Loans were terminated and repaid in the fourth quarter of 2016 in conjunction with the effectiveness of the 2016 Term Loans.
[3] The 2016 Term Loans mature on November 22, 2019.