Commitments and Contingencies (Textuals) (Details) $ in Millions		12 Months Ended
	Mar. 01, 2019 USD ($) ft²	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Total expense due to natural disaster		$ 64.4	$ 86.0
Deferred income		10.2	9.7
Number of years of lease of corporate headquarters	5 years
Area of leased office building (in square feet) | ft²	192,000
Purchase price of property at end of lease term	$ 41.2
Percentage of lease balance as final payment end of lease term	87.00%
Debt covenant, debt not paid when due	$ 75.0
Expense for known and future asbestos-related litigation		3.1	4.0	$ 3.5
Other Current Liabilities [Member]
Loss Contingencies [Line Items]
Deferred income		10.2	9.7
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Deferred income		$ 22.1	$ 19.3