Pension Plan (Details 2) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017
fair value of the plan assets	$ 107.3	$ 97.4	$ 101.1	$ 102.5
Fair Value, Inputs, Level 1 [Member]
fair value of the plan assets	0.5		0.6
Fair Value, Inputs, Level 2 [Member]
fair value of the plan assets	68.0		63.9
Fair Value, Inputs, Level 3 [Member]
fair value of the plan assets	38.8		36.6
Buy-In Contract [Member]
fair value of the plan assets	38.8		36.6
Buy-In Contract [Member] | Fair Value, Inputs, Level 1 [Member]
fair value of the plan assets
Buy-In Contract [Member] | Fair Value, Inputs, Level 2 [Member]
fair value of the plan assets
Buy-In Contract [Member] | Fair Value, Inputs, Level 3 [Member]
fair value of the plan assets	38.8		36.6
Diversified Fund [Member]
fair value of the plan assets	68.0		63.9
Diversified Fund [Member] | Fair Value, Inputs, Level 1 [Member]
fair value of the plan assets
Diversified Fund [Member] | Fair Value, Inputs, Level 2 [Member]
fair value of the plan assets	68.0		63.9
Diversified Fund [Member] | Fair Value, Inputs, Level 3 [Member]
fair value of the plan assets
Cash [Member]
fair value of the plan assets	0.5		0.6
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
fair value of the plan assets	0.5		0.6
Cash [Member] | Fair Value, Inputs, Level 2 [Member]
fair value of the plan assets
Cash [Member] | Fair Value, Inputs, Level 3 [Member]
fair value of the plan assets