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Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net cash flows used in investing activities $ (32.7) $ (45.4)
Net cash flows (used in) provided by operating activities 91.7 10.3
Net cash flows provided by financing activities $ 103.2 42.0
Accounting Standards Update 2016-15    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Noncash investing activities   27.7
Net cash flows used in investing activities   2.4
Net cash flows (used in) provided by operating activities   5.3
Net cash flows provided by financing activities   $ 5.3