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Fair Value Measurements (Estimated Fair Values of Long-Term Debt) (Details) - 3 months ended Mar. 31, 2021
€ in Millions, $ in Millions
USD ($)
EUR (€)
$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. 15, 2022  
€15.0 million fixed rate notes due May 2023 [Member]    
Debt Instrument, Face Amount | €   € 15.0
Debt Instrument, Maturity Date May 01, 2023  
$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. 15, 2025  
$500.0 Million Fixed Rate Notes Due June 2028, stated rate of 3.75% [Member] [Domain]    
Debt Instrument, Face Amount $ 500.0  
Debt Instrument, Maturity Date Jun. 15, 2028  
$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. 15, 2043  
$700.0 Million Fixed Rate Notes Due June 2048, stated rate of 4.15% [Member] [Domain] [Domain]    
Debt Instrument, Face Amount $ 700.0  
Debt Instrument, Maturity Date Jun. 15, 2048  
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 $ 779.4  
Debt Instrument, Face Amount $ 750.0  
Debt Instrument, Maturity Date Sep. 15, 2022  
Fair Value, Inputs, Level 2 [Member] | €15.0 million fixed rate notes due May 2023 [Member]    
Debt Instrument, Fair Value Disclosure $ 19.2  
Debt Instrument, Face Amount $ 15.0  
Debt Instrument, Maturity Date May 31, 2023  
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 $ 802.8  
Debt Instrument, Face Amount $ 750.0  
Debt Instrument, Maturity Date Mar. 15, 2025  
Fair Value, Inputs, Level 2 [Member] | $500.0 Million Fixed Rate Notes Due June 2028, stated rate of 3.75% [Member] [Domain]    
Debt Instrument, Fair Value Disclosure $ 557.4  
Debt Instrument, Face Amount $ 500.0  
Debt Instrument, Maturity Date Jun. 15, 2028  
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 $ 1,015.3  
Debt Instrument, Face Amount $ 750.0  
Debt Instrument, Maturity Date Sep. 15, 2043  
Fair Value, Inputs, Level 2 [Member] | $700.0 Million Fixed Rate Notes Due June 2048, stated rate of 4.15% [Member] [Domain] [Domain]    
Debt Instrument, Fair Value Disclosure $ 845.1  
Debt Instrument, Face Amount $ 700.0  
Debt Instrument, Maturity Date Jun. 15, 2048