Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 24.5	$ 23.5
Derivative instruments	0.5	1.6
Total asset recurring fair value measurements	25.0	25.1
Derivative instruments	0.4	3.4
Deferred compensation and other retirement plans	25.9	25.1
Total liability recurring fair value measurements	26.3	28.5
Total debt	1,510.4	1,541.4
Total financial instruments not carried at fair value	1,510.4	1,541.4
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0.0	0.0
Derivative instruments	0.0	0.0
Total asset recurring fair value measurements	0.0	0.0
Derivative instruments	0.0	0.0
Deferred compensation and other retirement plans	0.0	0.0
Total liability recurring fair value measurements	0.0	0.0
Total debt	0.0	0.0
Total financial instruments not carried at fair value	0.0	0.0
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	24.5	23.5
Derivative instruments	0.5	1.6
Total asset recurring fair value measurements	25.0	25.1
Derivative instruments	0.4	3.4
Deferred compensation and other retirement plans	25.9	25.1
Total liability recurring fair value measurements	26.3	28.5
Total debt	1,510.4	1,541.4
Total financial instruments not carried at fair value	1,510.4	1,541.4
Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0.0	0.0
Derivative instruments	0.0	0.0
Total asset recurring fair value measurements	0.0	0.0
Derivative instruments	0.0	0.0
Deferred compensation and other retirement plans	0.0	0.0
Total liability recurring fair value measurements	0.0	0.0
Total debt	0.0	0.0
Total financial instruments not carried at fair value	$ 0.0	$ 0.0