Employee Benefit Plans (Assets Measured at NAV) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Assets Category:
Fair Value	$ 184.3	$ 179.7
NAV [Member]
Assets Category:
Fair Value	$ 183.9	179.3
Commingled Pools / Collective Trusts [Member] | U.S. Equity [Member]
Assets Category:
Fair Value		$ 47.0
Redemption Frequency (if currently eligible)	Daily	Daily
Commingled Pools / Collective Trusts [Member] | International Equity [Member]
Assets Category:
Fair Value		$ 23.0
Redemption Frequency (if currently eligible)	Daily	Daily
Commingled Pools / Collective Trusts [Member] | Fixed Income [Member]
Assets Category:
Fair Value	$ 69.3	$ 64.9
Redemption Frequency (if currently eligible)	Daily	Daily
Balanced pension trusts [Member] | International Equity [Member]
Assets Category:
Fair Value		$ 5.1
Redemption Frequency (if currently eligible)	Daily	Daily
Balanced pension trusts [Member] | Fixed Income [Member]
Assets Category:
Fair Value	$ 12.6	$ 14.1
Redemption Frequency (if currently eligible)	Daily	Daily
Pension Funds [Member] | Fixed Income [Member]
Assets Category:
Fair Value		$ 25.2
Redemption Frequency (if currently eligible)	Daily	Daily
Pension Fund Member | Fixed Income [Member]
Assets Category:
Fair Value	$ 23.6	$ 25.2
Fair Value, Inputs, Level 2 [Member]
Assets Category:
Fair Value	183.9	179.3
Fair Value, Inputs, Level 2 [Member] | Commingled Pools / Collective Trusts [Member] | Fixed Income [Member]
Assets Category:
Fair Value	69.3	64.9
Fair Value, Inputs, Level 2 [Member] | Balanced pension trusts [Member] | Fixed Income [Member]
Assets Category:
Fair Value	12.6	14.1
Fair Value, Inputs, Level 2 [Member] | Pension Fund Member | Fixed Income [Member]
Assets Category:
Fair Value	$ 23.6	$ 25.2