Fair Value Measurements - Financial Assets and Liabilities Carried at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Liability
Liabilities:
Noncurrent deferred compensation liability	$ 11.8	$ 7.2
Liability | Quoted Prices in Active Market (Level 1)
Liabilities:
Noncurrent deferred compensation liability	0.0	0.0
Liability | Significant Other Observable Inputs (Level 2)
Liabilities:
Noncurrent deferred compensation liability	11.8	7.2
Liability | Significant Unobservable Inputs (Level 3)
Liabilities:
Noncurrent deferred compensation liability	0.0	0.0
Interest rate swap derivative contracts
Assets:
Swap derivate contract asset		0.1
Liabilities:
Swap derivative contract liability	8.3
Interest rate swap derivative contracts | Quoted Prices in Active Market (Level 1)
Assets:
Swap derivate contract asset		0.0
Liabilities:
Swap derivative contract liability	0.0
Interest rate swap derivative contracts | Significant Other Observable Inputs (Level 2)
Assets:
Swap derivate contract asset		0.1
Liabilities:
Swap derivative contract liability	8.3
Interest rate swap derivative contracts | Significant Unobservable Inputs (Level 3)
Assets:
Swap derivate contract asset		0.0
Liabilities:
Swap derivative contract liability	0.0
Cross-currency swap derivative contracts
Liabilities:
Swap derivative contract liability	61.8	8.9
Cross-currency swap derivative contracts | Quoted Prices in Active Market (Level 1)
Liabilities:
Swap derivative contract liability	0.0	0.0
Cross-currency swap derivative contracts | Significant Other Observable Inputs (Level 2)
Liabilities:
Swap derivative contract liability	61.8	8.9
Cross-currency swap derivative contracts | Significant Unobservable Inputs (Level 3)
Liabilities:
Swap derivative contract liability	$ 0.0	$ 0.0