Summary of Significant Accounting Policies - Schedule of Assets and Liabilities Measured and Recorded at Fair Value On Recurring Basis (Details) - Fair value measured on a recurring basis - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets
Deferred compensation plan assets	$ 107.3	$ 89.5
Cross-currency swaps	9.7	0.0
Foreign currency forward contracts	0.0	0.1
Total assets measured at fair value	117.0	89.6
Liabilities
Cross-currency swaps	6.0	0.0
Foreign currency forward contracts	0.0	0.1
Total liabilities measured at fair value	6.0	0.1
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Deferred compensation plan assets	107.3	89.5
Cross-currency swaps	0.0	0.0
Foreign currency forward contracts	0.0	0.0
Total assets measured at fair value	107.3	89.5
Liabilities
Cross-currency swaps	0.0	0.0
Foreign currency forward contracts	0.0	0.0
Total liabilities measured at fair value	0.0	0.0
Significant Other Observable Inputs (Level 2)
Assets
Deferred compensation plan assets	0.0	0.0
Cross-currency swaps	9.7	0.0
Foreign currency forward contracts	0.0	0.1
Total assets measured at fair value	9.7	0.1
Liabilities
Cross-currency swaps	6.0	0.0
Foreign currency forward contracts	0.0	0.1
Total liabilities measured at fair value	6.0	0.1
Significant Unobservable Inputs (Level 3)
Assets
Deferred compensation plan assets	0.0	0.0
Cross-currency swaps	0.0	0.0
Foreign currency forward contracts	0.0	0.0
Total assets measured at fair value	0.0	0.0
Liabilities
Cross-currency swaps	0.0	0.0
Foreign currency forward contracts	0.0	0.0
Total liabilities measured at fair value	$ 0.0	$ 0.0