Fair Value Measurements - Long-term Fixed Interest Rate Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 09, 2019	Dec. 31, 2018	Jul. 24, 2017
Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 1,166.6		$ 745.8
Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	1,195.7		727.3
Real Estate Mortgages and Other Debt | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	466.6		445.8
Real Estate Mortgages and Other Debt | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 468.7		448.7
5.250% Senior notes due 2025 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate, stated percentage	5.25%			5.25%
5.250% Senior notes due 2025 | Senior Notes | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 300.0		300.0
5.250% Senior notes due 2025 | Senior Notes | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 315.0		278.6
4.625% Senior notes due 2027 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate, stated percentage	4.625%	4.625%
4.625% Senior notes due 2027 | Senior Notes | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 400.0		0.0
4.625% Senior notes due 2027 | Senior Notes | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 412.0		$ 0.0