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Interim Financial Statements - Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Recent Accounting Pronouncements      
Decrease in other current assets due to reclassification related to ASU   $ (104.2) $ (73.9)
Accounting Standards Update 2015-17      
Recent Accounting Pronouncements      
Decrease in other current assets due to reclassification related to ASU     28.1
Decrease in deferred tax liabilities due to reclassification related to ASU     $ 28.1
Accounting Standards Update 2016-09      
Recent Accounting Pronouncements      
Employee taxes paid related to share-based compensation, ASU reclassification adjustment to operating activities $ 6.1    
Employee taxes paid related to share-based compensation, ASU reclassification adjustment to financing activities $ 6.1