Debt (Cash Flow Hedges) (Details) - Interest Rate Swap Locks - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
Derivative Instruments and Hedging Activities Disclosures [Line Items] | |||
Change in value of derivative instrument, tax | $ (22.5) | $ (30.2) | |
Effective portion of interest rate locks amortized as an adjustment to Interest expense expected over the next twelve months | $ 4.3 | ||
Senior notes: March 2025 | |||
Derivative Instruments and Hedging Activities Disclosures [Line Items] | |||
AOCI, cumulative loss, after tax | $ 25.8 | $ 30.4 |