Summary of Significant Accounting Policies - Fair Value Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 400.4	$ 424.1	$ 375.2
Level 3 | W.A. Sanders Coldenhove Holding B.V. | Insurance Contracts Acquired in Business Combination
Defined Benefit Plan Disclosure [Line Items]
Net Purchases/ (Settlements)	$ 46.8
Cash and cash equivalents | Level 1 | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0.8	1.7
U.S. and Non-U.S. Equities | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets measured at NAV		122.5	107.8
U.S. and Non-U.S. Fixed Income Securities | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets measured at NAV		219.4	192.7
Hedge Funds | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets measured at NAV		$ 29.9	$ 27.9