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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]      
Cash paid for interest $ 18.4 $ 11.6 $ 7.0
Cash paid for income taxes $ 78.1 $ 40.9 $ 49.8