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Debt and Credit Agreements Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term debt, gross $ 3,660.3 $ 1,287.6
Long-term debt, current maturities 0.1 2.0
Long-term debt, excluding current maturities 3,660.2 1,285.6
Deb instrument, unamortized debt issuance costs 26.0 13.0
Long-term debt, fair value 3,643.6  
3.50% Notes Due 2020 (less unamortized discount and issuance costs of $0.9 and $2.9, respectively)    
Debt Instrument [Line Items]    
Senior Notes 500.0  
Long-term debt, gross 496.6 0.0
Debt instrument, unamortized discount 0.8  
Deb instrument, unamortized debt issuance costs 2.6  
Long-term debt, fair value $ 499.9 0.0
Debt instrument, maturity date Oct. 01, 2020  
Interest rate, stated percentage 3.50%  
Debt instrument, interest rate, effective percentage 3.89%  
3.75% Notes Due 2021 (less unamortized discount and issuance costs of $0.3 and $3.2, respectively)    
Debt Instrument [Line Items]    
Senior Notes $ 500.0  
Long-term debt, gross 496.8 0.0
Debt instrument, unamortized discount 0.3  
Deb instrument, unamortized debt issuance costs 2.9  
Long-term debt, fair value $ 503.2 0.0
Debt instrument, maturity date Oct. 01, 2021  
Interest rate, stated percentage 3.75%  
Debt instrument, interest rate, effective percentage 3.98%  
4.00% Notes Due 2022 (less unamortized discount and issuance costs of $1.1 and $0.9, respectively)    
Debt Instrument [Line Items]    
Senior Notes $ 250.0  
Long-term debt, gross 248.2 247.6
Debt instrument, unamortized discount 1.0  
Deb instrument, unamortized debt issuance costs 0.8  
Long-term debt, fair value [1] $ 250.3 259.0
Debt instrument, maturity date Mar. 15, 2022  
Interest rate, stated percentage 4.00%  
Debt instrument, interest rate, effective percentage 4.13%  
3.75% Notes Due 2023 (less unamortized discount and issuance costs of $0.7 and $1.8, respectively)    
Debt Instrument [Line Items]    
Senior Notes $ 500.0  
Long-term debt, gross 497.7 497.1
Debt instrument, unamortized discount 0.6  
Deb instrument, unamortized debt issuance costs 1.7  
Long-term debt, fair value [1] $ 491.4 513.2
Debt instrument, maturity date Feb. 15, 2023  
Interest rate, stated percentage 3.75%  
Debt instrument, interest rate, effective percentage 4.32%  
4.20% Notes Due 2024 (less unamortized discount and issuance costs of $0.6 and $2.3, respectively)    
Debt Instrument [Line Items]    
Senior Notes $ 500.0  
Long-term debt, gross 497.3 496.7
Debt instrument, unamortized discount 0.5  
Deb instrument, unamortized debt issuance costs 2.2  
Long-term debt, fair value [1] $ 492.6 524.2
Debt instrument, maturity date Apr. 15, 2024  
Interest rate, stated percentage 4.20%  
Debt instrument, interest rate, effective percentage 4.24%  
4.65% Notes Due 2028 (less unamortized discount and issuance costs of $1.7 and $4.4, respectively)    
Debt Instrument [Line Items]    
Senior Notes $ 500.0  
Long-term debt, gross 494.0 0.0
Debt instrument, unamortized discount 1.7  
Deb instrument, unamortized debt issuance costs 4.3  
Long-term debt, fair value $ 494.1 0.0
Debt instrument, maturity date Oct. 01, 2028  
Interest rate, stated percentage 4.65%  
Debt instrument, interest rate, effective percentage 4.78%  
5.40% Notes Due 2048 (less unamortized discount and issuance costs of $2.8 and $5.6, respectively)    
Debt Instrument [Line Items]    
Senior Notes $ 500.0  
Long-term debt, gross 491.7 0.0
Debt instrument, unamortized discount 2.8  
Deb instrument, unamortized debt issuance costs 5.5  
Long-term debt, fair value $ 474.1 0.0
Debt instrument, maturity date Oct. 01, 2048  
Interest rate, stated percentage 5.40%  
Debt instrument, interest rate, effective percentage 5.48%  
Term Loan Due 2021 (LIBOR plus 1.25%)    
Debt Instrument [Line Items]    
Long-term debt, gross $ 400.0  
Loans Payable, Fair Value Disclosure 400.0  
Other notes payable and capitalized leases    
Debt Instrument [Line Items]    
Long-term debt, gross 38.0 46.2
Long-term debt, fair value [1] $ 38.0 $ 46.2
[1] See Note 12 for information on the fair value measurement of our long-term debt.