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Fair Value Measurements (Debt Instruments) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
$750.0 million fixed rate notes due September 2022, stated rate of 3.00%  
Debt Instrument, Fair Value Disclosure $ 762.8
Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Twenty Five, Interest Equal To Three Point Zero Percent [Member] [Member]  
Debt Instrument, Fair Value Disclosure 744.8
Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Forty Three, Interest Equal To Five Point Three Percent [Member]  
Debt Instrument, Fair Value Disclosure $ 863.5