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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jan. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]            
Foreign currency translation   $ (180.3)   $ (180.3)   $ (87.7)
Translation loss on net investment hedge, net of income taxes of $(17.3) and $(23.1), respectively   (19.8)   (19.8)   (39.9)
Translation loss on long-term intercompany loans   (128.9)   (128.9)   (128.8)
Unrealized gain on investments, net of income taxes of $3.4 for 2017   0.0   0.0   15.3
Accumulated other comprehensive loss   (375.9)   (375.9)   (288.2)
Accumulated other comprehensive income translation gain (loss) on net investment hedge, tax   (17.3)   (17.3)   (23.1)
Unrealized gain (loss) on investments, tax           3.4
Reclassification of unrealized cumulative gain on investments $ 15.3 0.0 $ 0.0 15.3 $ 0.0  
Defined benefit pension plans, net of income taxes of $(27.6) and $(27.8), respectively            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plans   (50.0)   (50.0)   (50.5)
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), tax   (27.6)   (27.6)   (27.8)
Retiree health care plan, net of income taxes of $1.9 and $2.0, respectively            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plans   3.1   3.1   3.4
Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), tax   $ 1.9   $ 1.9   $ 2.0