Lease Obligations (Lease Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating lease costs:
Lease costs	$ 61.8	$ 65.6	$ 65.4
Variable lease costs	17.4	15.0	18.6
Total operating lease costs	79.2	80.6	84.0
Short-term lease costs	6.3	6.6	6.6
Finance lease costs:
Amortization of right-of-use assets	1.4	1.5	1.8
Interest on lease liabilities	0.1	0.1	0.1
Total finance lease costs	1.5	1.6	1.9
Total lease costs	$ 87.0	$ 88.8	$ 92.5