Leases (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Components of lease expense [Abstract]
Operating lease cost		$ 5.6	$ 11.0
Finance lease cost [Abstract]
Amortization of right-of-use assets		0.3	0.7
Interest on lease liabilities		0.4	0.8
Total finance lease cost		0.7	1.5
Short-term lease cost		0.3	0.5
Cash paid for amounts included in the measurement of leases [Abstract]
Operating cash flows from operating leases			10.9
Operating cash flows from finance leases			0.8
Financing cash flows from finance leases			0.4
Operating leases [Abstract]
Other assets		57.3	57.3
Operating Lease Liability [Abstract]
Accrued liabilities	[1]	17.5	17.5	$ 0.0
Other liabilities		40.1	40.1
Total operating lease liabilities		57.6	57.6
Finance Leases [Abstract]
Property, plant and equipment		24.6	24.6
Finance Lease Liability [Abstract]
Short-term borrowings and current maturities of long-term debt		1.0	1.0
Long-term debt, less current maturities		24.9	24.9
Total finance lease liabilities		$ 25.9	$ 25.9
Weighted Average Remaining Lease Term (in years) [Abstract]
Operating leases		4 years 7 months 6 days	4 years 7 months 6 days
Finance leases		14 years 1 month 6 days	14 years 1 month 6 days
Weighted Average Discount Rate [Abstract]
Operating leases		2.40%	2.40%
Finance leases		6.30%	6.30%
Operating Lease Liabilities [Abstract]
2019 (excluding the six months ended June 30, 2019)		$ 9.8	$ 9.8
2020		16.6	16.6
2,021		11.7	11.7
2,022		8.0	8.0
2,023		5.3	5.3
Thereafter		9.2	9.2
Total lease payments		60.6	60.6
Less imputed interest		(3.0)	(3.0)
Total operating lease liabilities		57.6	57.6
Finance Lease Liabilities [Abstract]
2019 (excluding the six months ended June 30, 2019)		1.3	1.3
2020		2.5	2.5
2021		2.6	2.6
2022		2.6	2.6
2023		2.7	2.7
Thereafter		28.8	28.8
Total lease payments		40.5	40.5
Less imputed interest		(14.6)	(14.6)
Total finance lease liabilities		25.9	25.9
Future minimum rental payments for operating leases [Abstract]
Future minimum rental payments for operating leases, 2019		25.8	25.8
Future minimum rental payments for operating leases, 2020		19.5	19.5
Future minimum rental payments for operating leases, 2021		13.9	13.9
Future minimum rental payments for operating leases, 2022		7.7	7.7
Future minimum rental payments for operating leases, 2023		5.4	5.4
Future minimum rental payments for operating leases, Thereafter		9.4	9.4
Future minimum rental payments for capital leases [Abstract]
Future minimum rental payments for capital leases, 2019		0.8	0.8
Future minimum rental payments for capital leases, 2020		1.0	1.0
Future minimum rental payments for capital leases, 2021		1.1	1.1
Future minimum rental payments for capital leases, 2022		1.2	1.2
Future minimum rental payments for capital leases, 2023		1.4	1.4
Future minimum rental payments for capital leases, Thereafter		$ 20.7	$ 20.7

[1] The Company adopted ASU 2016-02, Leases, on January 1, 2019 using the optional transition method.  See Note 1 “Condensed Consolidated Financial Statements” for further discussion of the adoption of ASU 2016-02 and Note 14 “Leases” for discussion of the Company’s operating and financing leases.