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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]      
Cash paid for interest $ 88.7 $ 82.3 $ 78.8
Cash paid for income taxes, net of refunds [1] 207.9 228.4 244.1
Tax refunds $ 24.3 $ 31.9 $ 26.6
[1] Refunds of $24.3, $31.9 and $26.6 were received for the years ended December 31, 2018, 2017 and 2016, respectively.