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Basis of Presentation and Summary of Significant Accounting Policies (Supplemental Cash Flow Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Information      
Interest paid, net of amounts capitalized $ 60.5 $ 57.8 $ 65.9
Income taxes paid 12.5 6.5 34.0
Non-cash capital lease additions (see Note 12) 2.4 0.5 21.0
Acquisitions of businesses (see Note 3):      
Fair value of assets acquired, net of cash 124.9 0.0 0.0
Liabilities assumed (89.8) 0.0 0.0
Goodwill 54.6 0.0 0.0
Noncontrolling interests (18.3) 0.0 0.0
Acquisition of businesses—net of cash acquired $ 71.4 $ 0.0 $ 0.0