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Indebtedness (Overview) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]      
Weighted average interest rate 3.80% 3.80% 4.30%
Interest costs capitalized $ 24.5 $ 21.0 $ 24.1
Cash paid for interest $ 118.4 $ 111.8 $ 142.7