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Recently Issued Accounting Pronouncements - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Long-term deferred tax assets $ 1,715.5   $ 1,656.5 $ 100.2
Long-term deferred tax liability 815.4   221.5 205.8
Other assets 110.1   47.7 71.8
Other long-term liabilities $ 265.2   $ 239.2 240.9
Accounting Standards Update 2016-16        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Long-term deferred tax assets   $ 1,580.0   1,579.4
Long-term deferred tax liability   (1.1)   (1.1)
Other assets   (24.1)   (24.1)
Other long-term liabilities   $ (1.7)   $ (1.7)