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Fair Value Measurements (Estimated Fair Values of Long-Term Debt) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
$750.0 million fixed rate notes due September 2022, stated rate of 3.00% [Member]  
Debt Instrument, Face Amount $ 750.0
Debt Instrument, Maturity Date Sep. 01, 2022
Debt Instrument, Interest Rate, Stated Percentage 3.00%
$750.0 million fixed rate notes due March 2025, stated rate of 3.00% [Member]  
Debt Instrument, Face Amount $ 750.0
Debt Instrument, Maturity Date Mar. 01, 2025
Debt Instrument, Interest Rate, Stated Percentage 3.00%
$750.0 million fixed rate notes due September 2043, stated rate of 5.30% [Member]  
Debt Instrument, Face Amount $ 750.0
Debt Instrument, Maturity Date Sep. 01, 2043
Debt Instrument, Interest Rate, Stated Percentage 5.30%
Fair Value, Inputs, Level 2 [Member] | $750.0 million fixed rate notes due September 2022, stated rate of 3.00% [Member]  
Debt Instrument, Fair Value Disclosure $ 766.2
Fair Value, Inputs, Level 2 [Member] | $750.0 million fixed rate notes due March 2025, stated rate of 3.00% [Member]  
Debt Instrument, Fair Value Disclosure 751.2
Fair Value, Inputs, Level 2 [Member] | $750.0 million fixed rate notes due September 2043, stated rate of 5.30% [Member]  
Debt Instrument, Fair Value Disclosure $ 900.1