Derivative Instruments (Details) $ in Millions			12 Months Ended			24 Months Ended
	Jun. 16, 2021 USD ($)	May 27, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2011 USD ($) instrument
Derivative [Line Items]
Amortization of interest expense			$ 1.7	$ 1.7	$ 1.4
Non-cash interest expense associated with forward starting swaps			$ 3.3	$ 6.0	$ 6.3
Senior Notes | 4.50% Senior Notes, due December 2020
Derivative [Line Items]
Interest rate on senior notes			4.50%
Amount to be recognized from hedged transactions within 12 months, approximate		$ (1.4)
Senior Notes | 4.20% Senior Notes, repaid in June 2021
Derivative [Line Items]
Interest rate on senior notes			4.20%
Amount to be recognized from hedged transactions within 12 months, approximate	$ (1.3)
Interest Rate Contract
Derivative [Line Items]
Derivative, number of instruments held | instrument						2
Interest Rate Exchange Agreement Expiring Two Thousand Ten and Eleven
Derivative [Line Items]
Amortization of interest expense						$ 68.9
Term of amortized interest expense, years						10 years